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A diverter valve is an important part of any heating system. It usually operates out of sight to allow the boiler to provide heat to multiple parts of a property. However, those with an overhead shower bath will have seen how diverter valves work first-hand. Loss of boiler valve functionality can leave someone without central heating, hot tap water, or both. 

In this blog, we’ll discuss how a diverter valve in a boiler works, what diverter valves issues look like, and how they can be resolved. 

 

Diverter valves

Diverter valves are important parts that control the flow of hot water and gases. This can be a vital function in many heating and cooling systems, not just in boilers. Diverter valves can also be found in: 

• Motor vehicles 
• Showers 
• Industrial machinery 

The appearance of a diverter valve will vary across brands and industries. However, most feature multiple inlets with a lever, pin, or other kind of control mechanism. Diverter valves can also use a range of materials such as aluminium, stainless steel, carbon steel, and plastic. They are typically located at easily accessible positions within the appliance so that any issues can be easily resolved. 

 

How a boiler diverter valve works

In a boiler, once the water has been heated, the diverter valve is responsible for directing it to different areas around the property. This includes systems that are supplied by hot water, such as radiators, taps, and showers. For example, if you were to turn the tap on when the central heating is on, the hot water supply will be temporarily diverted away from the latter. 

Diverter valves are not present in regular home boilers and heating systems. Instead, they are exclusively a combi boiler feature. The valve will open and close depending on where the hot water supply is demanded. When water is required for your home’s central heating system, the diverter valve will send water from the boiler’s primary heat exchanger. If it needs to supply taps or showers, water will be directed to the plate heat exchanger first. 

Read our blog ‘What is a heat exchanger in a boiler?‘. 

 

Common diverter valve problems

All boiler parts, including diverter valves, are susceptible to wear, degradation and eventual breakage. A diverter valve is an important boiler part as it’s responsible for the efficient assigning of hot water throughout residential properties. As such, when issues arise it’s useful to have a quick option for accessing spares like NBS. People often notice a problem with their boiler diverter valve when the following symptoms start appearing. 

Loss of temperature 

If you notice that your taps are only producing lukewarm water, even when turned to the highest temperature, there could be an issue with your boiler’s diverter valve. Most often, this is due to the valve getting stuck and not allowing as much water through as it should be.  

While the boiler is functioning in its heating of the water, it’s losing efficiency as the hot water isn’t being allocated correctly. As a result, this issue can lead to inflated gas and water bills. 

Lack of central heating

As with the above problem, this is likely caused by a stuck diverter valve. In this case though, it will be stuck in the position that supplies hot water to taps and other outlets. This prevents hot water from getting to radiators and heating the building itself. It’s entirely possible for this to be reversed, with the property having no hot running water but central heating. 

No hot water

A faulty or defective boiler diverter valve can be the cause of more severe boiler problems. These can include the build-up of magnetic sludge, increased limescale, or leaks. If hot water isn’t coming out of the taps, and the central heating isn’t effective, it could stem from a damaged or faulty boiler diverter valve It can also result in hot water only being available when the central heating is turned on. 

The cost of fixing or replacing a diverter valve can be high. However, it’s always going to cheaper than replacing your entire boiler. Especially if you source diverter valves from a competitive supplier like NBS. 

 

Fixing a boiler diverter valve

The above diverter valve problems need to be resolved quickly if proper heating is to be restored to the home. In the most severe cases, the valve issue must be addressed to prevent further damage to the boiler. 

Although the boiler diverter valve will often be accessible through the panel on the back or underside of the appliance, it’s recommended to have a qualified heating engineer come to fix the issue. They can assess whether the diverter valve is the cause of the problem and if so, provide a solution. 

Sometimes it’s a simple case of cleaning the part and the surrounding area to ensure proper function. Other times, it’s best to replace the diverter valve. It’s a hard-working part and oftentimes the valve won’t outlast the boiler system as a whole. Therefore, sourcing diverter valve spares can improve the lifespan of a home’s boiler. 

 

Diverter valve boiler parts 

National Boiler Spares are proud members of the Heating Trade Supplies Group. We’re leading re-manufacturers of boiler spares, providing vital services to professionals and homeowners. Our range of parts can allow boiler repairs to solve many different issues, regardless of make, model, and age. 

Contact us today. 

Worcester Bosch has become a household name with an impressive reputation for the high-quality appliances it manufactures. You’ve might even have heard that Worcester Bosch boilers are the best value for money. If you want a reliable system for the long term. However, some people believe that the extra money you pay for a WB boiler over other brands is just for the name and they aren’t really any better. In this guide we’ll be looking at how long Worcester boilers are meant to last, how long they actually last, diving into their quality and what sets them apart from their boiler competitors.  

 

Typical lifespan of a Worcester Bosch boiler

For boilers in general, the average lifespan is normally somewhere around 10-15 years. However, this can vary depending on factors like the brand, length of the warranty, and the type of boiler. Worcester Bosch typically offers guarantees that last up to 12 years depending on the exact model you have. Reportedly Worcester boilers can last between 12 and 15, but some have even lasted as long as 22 years without showing signs of slowing down.  

So, when looking at how long a Worcester Bosch boiler should last, it should be at least 10 years like any other boiler. However, there is an expectation that it would last quite a few years longer. Considering the higher cost and expectation on the Worcester Bosch brand. Even with any problems along the way and the need for a boiler part replacement. A Worcester Bosch boiler will still offer an impressive lifespan that is worth the extra cost for many homeowners.

 

What makes Worcester Bosch boilers so reliable? 

Worcester Bosch market themselves as premium brand that produce premium parts, which sets them apart from other boiler manufacturers. Experienced engineers have said you can notice the difference between Worcester boilers and other brands. Simply just by how quiet they are when they’re running. Matched only by Vaillant, Worcester Bosch boilers are some of the quietest you can get on the market.  

Another reason that these boilers are so reliable and long-lasting is the level of quality control and attention to detail the manufacturer has. Worcester Bosch regularly tests the boilers they produce, ones that pass the test are packaged up and sent to the customer as normal. Some homeowners will have a Worcester Bosch boiler that has a red dot on it. This means that the boiler has been double tested before being sent to the customer. They have strict systems in place to ensure only the best quality boiler systems are sold. Without any defaults or problematic parts slipping through the net.  

 

Worcester Bosch maintenance and guarantees

Like with any important household item, how long your boiler lasts and the service you get from it depends on how well you look after it as well. Firstly, you should make sure you get a good warranty on your boiler when you purchase it. This will help you know what repairs you can claim for should your boiler break down. To save you spending money when you don’t need to.  

You should ensure your warranty is registered with Worcester Bosch. This is because you will be able to get your boiler fixed free of charge in the event something does go wrong with it. It’s important to note that boiler controls and accessories won’t be covered under the full boiler manufacturer’s guarantee. Also, you won’t be able to get a free repair or replacement of faulty parts if your claim is not made within your guarantee period.  

If your system is older and no longer has a guarantee or warranty. You can find affordable and high-quality Worcester Bosch boiler spare parts from us at NBS. To ensure the longevity of your boiler you need to stay on top of its annual services. This will allow any potential issues within your Worcester Bosch boiler system to be found and addressed early. Before they cost you a significant amount of money or cause irreparable damage.

 

Conclusion

As established boiler spare parts suppliers, we understand the benefit of offering affordable new and refurbished boiler parts to customers. With the difficult economic climate, we’re currently facing no one wants to spend more money than they need to – but all homes need a working boiler. By purchasing the exact part, you need for your make and model of boiler from us, not only will you be saving money but also supporting the environmental benefit we provide by refurbishing existing parts and spares. Explore our online shop today to find the Worcester Bosch boiler parts you need. Don’t hesitate to get in touch if you have any questions.  

A filling loop serves a vital role in boiler systems – repressurising. Although filling and repressurising can be achieved through other means. Boilers can be seriously damaged by loss of pressure or having too much pressure. As such, a filling loop that has lost functionality should be addressed quickly to avoid wider heating issues. 

In this blog, we’ll cover how filling loops work, what they look like, and the boilers they can be found in. 

 

What does a filling loop do?

A filling loop is a boiler component that is designed to provide a temporary connection to mains water supply. It allows the system to be refilled and repressurised. This is important to maintain boiler efficiency and avoid issues affecting your central system.  

It’s often recommended to repressurise a boiler when: 

• Your radiators have recently been bled. 
• Soon after your boiler pressure drops below one bar. 
• The boiler has a small leak. 
• Your boiler has a fault that’s affecting its functionality. 

The filling loop typically consists of a length of solid or flexible piping, ending in two valves. One of these will be a stop valve and the other a double check valve. The former controls the flow of water as it passes through the loop and into the boiler. The latter gets its name from the fact it contains two spring-loaded mechanisms. These have an anti-backflow function – preventing water from flowing from the boiler into the mains.

 

Types of filling loop

While all boiler filling loops are intended to serve the same purpose, they can come in a wide variety of designs and models. There are also two different types, which vary based on how they feed into the boiler. Certain types of boilers will often contain one type of filling loop, which is good to know when it comes to repairing or replacing the part. 

External

External filling loops consist of a braided hose with compression fittings at each end. These are the stop valve and double check valve respectively. The former connects to the boiler at its designated terminal, and the latter connects to the mains water line. External loops are used when the mains connection port is located far away from the boiler. As a result, the length of an external filling loop will vary depending on the distance it has to reach. 

Internal

This type follows the same appearance and features as an external filling loop, except it is fully integrated with the boiler system. Due to this, many internal filling loops will be shorter and forgo braiding on the hose.  

Both internal and external filling loops can be purchased separately. External filling loops can usually be found in decent hardware shops, although the choice may be limited. On the other hand, internal designs are often harder to find as they have to sit within the boiler’s housing. NBS has a large range of filling loops of all types and designs. 

 

Which type of boilers have a filling loop?

Not all boilers have a filling loop, such as an old Worcester boiler. These older boilers sometimes have a hot water cylinder, which is a standalone tank that is designed for pressurisation. However, most boilers produced within the last 5-10 years will have a filling loop. The nature of the parts will vary across different boiler types and models. As a result, it’s important to know when sourcing boiler spares. 

Combi boiler

Most combi boilers have internal filling loops that are fully in-built behind the boiler cover. In some cases, these boilers will have an easy filling link instead. This commonly appears as a single green or blue lever on the underside of the system. Pulling it down causes water to flow into the boiler. 

Regular domestic boiler 

Household boilers are often positioned close to water pipes so they can access the mains supply. Regardless of whether the system has an internal or external filling loop, it can usually be found on the underside of the boiler. 

Centralised boiler plant

In apartment buildings there’s usually a main boiler that supplies hot water to different flats within the complex. Here, filling loops are used to fill and pressurise Heat Interface Units (HIUs). 

 

Using a boiler filling loop

Repressurising your boiler with a filling loop can be done without a heating engineer. However, this should be done with care as boiler systems can be damaged by pressure that’s too high. The pressure inside your boiler refers to the balance of air and water in the system. Some components are not equipped to function when there’s a sizable imbalance. Don’t worry though, we’ve put together quick guides for using both internal and external filling loops. 

Internal filling loop

• Turn off the electricity and the boiler. 
• Open the hatch and insert the filling key. 
• Activate the system following its normal process (this will vary between boiler brands) 
• Tighten the knob clockwise and turn the key so it’s in the open padlock position. 
• The pressure gauge should show the level increasing.  
• When it reaches the range between 1-1.5 bars, remove the key.

External filling loop

• Turn off the boiler and remove the isolation valve cap. 
• Fit the external filling loop (this will vary depending on how the boiler is set up) and tighten both ends. Make sure both valves are in the correct position. 
• Turn the lever slowly to allow water into the boiler. 
• Check that the pressure gauge is in the 1-1.5 bar range, after which, turn the lever to the closed position. 
• Disconnect the external filling loop and clean up any spillage.

 

Expertly remanufactured boiler parts

If you’re looking for a supplier to help with the repair of your boiler filling loop, look no further than NBS. We stock a large range of OEM parts and widely compatible boiler spares that can be used in domestic heating systems. With us, you’ll have a quick and effective solution to your boiler repair needs. Contact us today. 

 

If you aren’t super knowledgeable about boilers (which is understandable as most homeowners won’t be) you might not be fully sure how all the controls for your system work. With all the modern technological advancements in recent years too, it might feel like your central heating and hot water system is complex and difficult to use, but it’s actually pretty straightforward. In this guide we’ll be explaining how the key controls on your boiler work. So, you can be sure that you’re using it effectively and maximising its efficiency and capabilities as much as possible.

Setting up your boiler controls

Your boiler controls are essential for managing your heating and water supply. It might not seem like it, but they can make a big difference to your overall efficiency and energy bills. The Energy Saving Trust has even stated that making minor changes like installing smart thermostats and thermostatic radiator valves (TRVs), could save you anywhere between £75 and £155 per year. Not only that but reducing the temperature of your heating by only 1C can save you roughly £80. So, having your controls set up correctly and fully understanding their workings is going to be hugely beneficial to you.

To set up your controls properly you first need to determine what type you already have, or which ones you want to have installed. The majority of boiler systems will come with a room thermostat, and as mentioned above you can benefit from your radiators featuring TRVs. The exact right way to use your boiler controls can depend on the type and model of your unit. If you need specific details and direction on how to use your controls, be sure to check your boiler manual. The four controls we will be covering below are:

• Room thermostat
• Boiler thermostat
• Boiler timer control
• Thermostatic radiator valves

Room thermostat

As the name suggests, the purpose of a room thermostat is to read the temperature of a room and feed that information back to the boiler system. If the room drops below the temperature, you set it to, the thermostat will trigger the boiler to turn on. When the room is heated up to the set temperature, the heating system will switch off.

Your room thermostat should be located on a wall in your home that is away from your boiler and radiators, in a central area that isn’t exposed to direct sunlight. This will allow the sensor to read the temperature of the room accurately. Analogue and digital are the two types of thermostats you can get with the latter being more popular due to their modernity and advanced features that improve their accuracy. However, if you’d prefer a standard display and a simple option then an analogue thermostat will be suitable and effective.

A room thermostat is an important control as it can help you become more energy efficient in your home. Without one, your boiler wouldn’t know when to stop sending hot water through your radiators and your house would get very hot.

It is recommended that you set your daytime temperature at roughly 20C and your night temperature between 16C and 19C if you want to be more efficient and save money on your bills.

Boiler thermostat

Your boiler thermostat allows you to control the temperature of your central heating and hot water. Therefore, you have the ability to set the temperature your specific preferences. This is especially useful for different seasons as you will want your heating on in the winter and will leave it turned off throughout the summer. In terms of your hot water, the recommended temperature for it to be set at is roughly 60C and 75C for your radiators.

It is important to remember that if the water temperature is set too low, it can create favourable conditions for bacteria to grow. Therefore, the temperature should be set to no lower than 60C. The thermostat of the boiler is connected to the timer control, which will be discussed later in the guide. This connection allows you to set the boiler to come on at certain times of the day with the preferred temperature.

Boiler timer control

Every boiler will come with a timer that allows you to set what time during the day you want your boiler to come on and how long it should be on for. Most homeowners will programme the boiler to be on in the morning, turn off during the day while they’re at work then come on for a few hours when they get back or are just about to get back in the evening.

More modern timers even have a seven-day function, so you can set different times for your boiler during the week compared to weekends when you’ll be in the house more. Also, certain types of boilers, particularly combi systems will have a mechanical timer. It comes in the form of a round dial with a 24 hour clock on it. Each hour is split into 15 minute slots, so you have the option to put your boiler on for some extra heat if you need it at a time that doesn’t fall in your programmed hours.

Thermostatic radiator valves (TRVs)

These valves allow you to control the temperature in each individual room of your home via the radiators. They come in the form of nozzles at the bottom of the radiators and feature numbers 1-5. When the TRVs are set to 5 the radiators will be at their hottest as their will be more flow of hot water going through them.

You shouldn’t have a TRV on a radiator that’s in the same room as your thermostat. This is because a tampered radiator will lead to inaccurate temperature readings on the thermostat and send the entire system off balance.

It is typically recommended that your TRVs are set to 3, which is around 20C. Except for bedroom radiators which should be a bit cooler at number 2.

Conclusion

We hope this guide has given you a clearer insight into the key controls on your boiler system. If you have any problems with your heating controls or any of your central heating parts NBS can help. We specialise in providing high quality, affordable new and refurbished UK boiler parts for our customers. Explore our online shop today to find the right boiler spares for your system.

Boilers can break down due to faults in any number of parts. This is the case when it comes to faulty boiler gas valves. When most modern boilers detect a gas valve fault, they’ll enter lock out and display an error code. As such, resolving a gas valve boiler fault is essential to restore heating to the home.

The early warning signs of a faulty gas valve usually come in the form of rattling or humming. While most boilers will make some noise, this should be noticeably louder. Read on for the possible causes of gas valve faults, how to fix them and where to get boiler spares.

What does a boiler gas valve do?

To understand how gas valves can become faulty, lets first go over its role within the boiler. A boiler gas valve controls the flow of fuel to the burner. It’s opened when hot water or heat is called upon. The pilot light then ignites the boiler to allow for continuous heating. Once the NTC thermistor senses it has reached the appropriate temperature, the gas valve is closed. The printed circuit board (PCB) is responsible for detecting when the boiler is ready to start heating, as well as when to stop the flow of gas fuel.

Gas valve faults occur what the supply of fuel is disrupted. This results in scenarios where the boiler flame is either too small, disrupted or lost. Faults that cause too much gas to be let in can be dangerous.

Causes of gas valve faults for boilers

Seized/stuck valve 

One of the most common fault causes, a boiler gas valve can be stuck either open or closed. In the former case, gas will be letting by even when hot water and central heating are turned off. This valve closure failure is called ‘letting by’. The latter prevents any fuel reaching the burner. Boiler gas valves are mechanical components which makes them susceptible to becoming worn and misshapen.

Incorrect valve adjustment 

Boiler gas values typically get adjusted during check-ups. Sometimes this can lead to incorrectly adjusted valves or valves which become misadjusted on accident. Sometimes a gas valve will be pre-adjusted to a setting that doesn’t fit within the boiler it’s installed in. This leads to a boiler’s gas valve being unable to open and close properly.

Wiring or connectivity problems 

Internal wiring in boilers dictates how different parts and components speak to each other. This is signals are vital to boiler operations following the correct process. For example, sporadic or unreliable signals mean the PCB isn’t aware of the status of the boiler gas valve. These problems can in turn be caused by wires being shaken loose.

PCB malfunction 

The printed circuit board (PCB) is the part responsible for controlling boiler components when a command is received. It’s also responsible for detecting issues and executing an appropriate reaction i.e. error codes or lock out. As such, if a fault cause can’t be easily identified, it could be the PCB that’s the issue. If so, it can cause issues in other areas like boiler waste disposal or the gas valve.

Defective valve 

Lastly, the gas valve for boiler can simply fail due to old age or damage. Cracks and large scale malforming can result in a valve being unfixable. Electrical systems can also be extremely costly to repair when they experience faults. In either scenario, it is often better to get a replacement boiler gas valve. Have a look at the NBS range of boiler spares.

Ways to fix a faulty boiler gas valve

How to go about fixing a faulty boiler gas valve will depend on what is causing the fault. The solutions to these faults therefore start with having a professional engineer investigate the boiler and find the issue. For connection and PCB issues this will require the use of a multi-meter. Simple electrical fixes will be a case of reconnecting a dislodged wire. However, more severe faults due to connection or PCB malfunctions can cost a lot to repair.

In the event a stuck valve cannot be returned to functionality by freeing, resetting, and testing, it will need replacing. This is because it likely has got stuck or seized due to irreparable damage. Reconditioning kits are available for some boiler parts, however, they tend to be far more expensive than replacing a gas valve.

Be sure to check your boiler warranty, as this can cover the cost of replacing a gas valve.

Gas Valve Boiler Spares UK

If you need a gas valve boiler replacement, NBS has a substantial range to choose from. We offer brand new spare parts for both old and new boiler models. That way, our customers are never at a loose end when their home is unexpectedly left without heat or hot water.

Contact us today.

A heat exchanger transfers energy from one system to another without the need for contact. As water passes through the boiler pipes, the burner creates hot flue gasses which warm the surface of the pipe. Due to the high amount of stress experienced by heat exchangers, they’re commonly made of either aluminium or stainless steel.

The heat exchanger forms the beating heart of any boiler. As such, understanding how it works is important to keep your home warm and full of hot water.

What Types of Boilers Use Heat Exchangers

All household boilers are heat exchange boilers. This is because it’s a more efficient way to heat water than simply combining hot and cold water, or by using an open flame. However, certain boiler types will contain a different amount of heat exchangers or feature a different configuration.

Condensing boilers

Condensing boilers use the warm air and pipe heating method described above. In addition, the boiler has a ‘condensing’ area with a secondary heat exchanger that collects and disposes of water droplets. These form when warm air passes over pipes containing water that’s returning from radiators. This creates greater heat efficiency, as condensing boilers can recover as much heat as possible before it leaves the system.

Non-condensing boilers

Unlike condensing boilers, non-condensing boilers only feature a single heat exchanger. This, combined with their shorter pipe coil, causes non-condensing boilers to have a large carbon footprint. Due to their lesser efficiency, non-condensing boilers will typically release flue waste at higher temperatures (200°C or more).

The UK government requires all newly built boilers be condensing. So non-condensing types will only be found in older properties (pre 2005).

Combi boilers

Combination boilers usually contain two heat exchangers, one for central heating and one for creating hot water. The primary heat exchanger oversees the heating of radiator water. This travels to and from the boiler in the same way as other boilers and undergoes consistent heating as it moves through the system. It’s secondary plate heat exchanger diverts hot water from the combi boiler’s primary heat exchanger to taps and other fixtures. The secondary heat exchanger is itself heated by its counterpart.

What Causes Heat Exchanger Faults?

Like any boiler part, heat exchangers can fail due to long-term wear and tear. However, there are two common boiler issues that, if not addressed, can result in heat exchanger failure.

Limescale

Over time limescale can build up in areas of the boiler where water is present. This takes up internal space, leading to potential overexertion. If left untreated, limescale can cause boiler inefficiency and create blockages. Limescale build-up is more common in regions with high mineral content water.

To mitigate limescale build-up, a reducer or silencer can be used. The former acts like a drain cleaner, breaking down limescale as it passes through the boiler system. A reducer will collect limescale at the filter, preventing it from getting to important parts.

Sludge build-up

Sludge can cause blockages that risk total boiler failure. It’s typically made up of rust and general debris, which is a by-product of hot water reacting with steel. Sludge often settles in radiators, becoming dislodged as water passes through plumbing and returns to the boiler.

The best way to prevent sludge build-up is with regular boiler inspections and cleaning. This will help remove sludge from the system and stop it disrupting heat exchanger functionality. You can ask an engineer to do this when your boiler is getting its annual service.

Symptoms of a Faulty Heat Exchanger

If you suspect your boiler’s heat exchanger is defective or experiencing faults, look out for the following signs:

• The boiler is making unusual noises – the type of noise will often relate to one of the above problems. With limescale build up, the temperature of water inside the boiler rises. This causes bubbles and steam, resulting in whistling sounds. In contrast, a build of sludge in a boiler system will produce a tapping or knocking.
• Boiler leakages – in older boilers, leakages will be visibly identifiable. Water dripping from the bottom of the casing most often means there has been a build-up of sludge, causing the heat exchanger to malfunction. As modern boilers are better put together, noticing a cracked or leaking heat exchanger can be more difficult.
• Presence of dirty water – this is an almost guaranteed sign of sludge in the system. An easy way to check for dirty water is to bleed the radiator, which is recommended throughout the year anyway. The presence of dark or discoloured water signifies the heat exchanger might be in peril.

Looking for Boiler Spares UK?

You can protect your boiler’s heat exchanger by conducting regular maintenance checks. The overall health of a boiler can also impact heat exchanger functionality, which can sometimes mean replacing select parts. Where a replacement heat exchanger would often cost upwards of £500, National Boiler Spares has a range of heat exchangers that are far more affordable. Whatever make or type of boiler you need help with, we’ve got you covered.

Contact us today.

If you’ve just recently moved into a new property or you’ve never had an issue with your boiler you might not be aware of what type of boiler you actually have. Even if it hasn’t been an issue for you so far, it will be beneficial knowing what boiler system you have for if and when it breaks down. We’ve created this handy guide to help you determine the type of boiler you have. To ensure you’re fully prepared and knowledgeable if you encounter a problem with the system that needs repairing or replacing.

What do we mean by type of boiler?

When determining which boiler your home has, it is important to look at the size of your property, your heating needs, and the type of fuel you use if you know it. There are three main types of boilers: combi, system, and regular. Each of these has different features, so it is not difficult to tell which one you have. For instance, you will be billed for the fuel your boiler requires, such as gas.

Or there will be an LPG/oil tank outside your home and there will be a cost to fill it. A lot of boilers are often run on gas, which is important to remember if you need to buy replacement gas boiler spare parts UK. Be sure to check though and not assume that your boiler uses gas. Especially if you’re in a newer home as there has been a push in recent years for electric boilers to reduce emissions and improve efficiency.

How to tell which boiler type you have

The best way you can determine what type of boiler you have is to look at the components of the heating system. We’ll explore they key features of each boiler type in more detail further down. For now though, we’re just going to look at how you will be identify which one you have on a surface level.

• If you have a hot water cylinder in your airing cupboard you probably have a system boiler.
• If you have a cold-water storage tank in your loft, an external pump, and a hot water cylinder in the airing cupboard it suggests you have a regular boiler.
• If you have none of the above features, then it is likely that you have a combi boiler system.

System boilers

System boilers are mostly found in homes where the demand for hot water is high. Water is stored in the cylinder mentioned above and then supplied to one or more bathrooms and taps when needed. Another way that you can identify a system boiler is if you can see three copper pipes coming out of it (combi boilers will have five pipes). The main difference between a system boiler and a regular boiler is a system boiler will take water directly from the mains. Whereas a regular boiler will use a feed and expansion tank.

One of the most useful benefits of system boilers that they can provide hot water across your home all at the same time without impacting the heating. Also, they don’t need a cold-water tank which saves you a bit of space. However, you will need a fair amount of space for your hot water cylinder, meaning this type of system is typically unsuitable for smaller properties and flats. Another drawback of system boilers is when you have used all the hot water being stored in the cylinder, you’ll have to wait for it to fill up again before you can access any more hot water.

Regular boilers

Also known as conventional, traditional, open vent, or heat-only boilers, regular boilers take up a lot of space and are often challenging to install. They work in a similar way to system boilers in the sense that they can meet high demands for hot water by storing it until it is needed. This means they come with the same benefit of being able to easily provide hot water to multiple bathrooms and taps in large properties. However, they also have the same drawback of having to wait for them to refill once the water runs out.

Also, regular boilers have extra components compared to system boilers including a cold-water storage tank and an expansion cistern. As a result, they take up significantly more space and are mostly suited to large properties only. If you’re not quite sure whether you have a regular or system boiler, again you can look at the pipework. A regular boiler will have two copper pipes coming out of it, one from the top and one from the bottom.

Combi boilers

Combi or combination boilers are a type of system where water is heated instantly when needed, rather than being stored in a tank like other systems. The water heating and central heating components are combined into one unit, making them much more compact and simpler to install. These boilers take up significantly less space than regular boilers, making them a great choice for smaller homes or flats where space is limited.

Combi boilers are noteworthy for their energy efficiency due to the fact that they only heat water when it is necessary, instead of keeping it stored. This can lead to many positive outcomes, such as conserving energy, lowering your carbon footprint, and also saving money on energy bills. You can determine if your home has a combi boiler by the presence of five copper pipes, with no extra components.

However, it’s important to note that you could still have additional elements like a storage tank and still have a combi boiler. It might just be that a combi boiler was recently installed and the parts from the previous boiler system have been left redundant. To avoid confusion further down the line if you end up needing combi boiler spare parts. Make sure you know which parts of the boiler are being used.

Conclusion

Hopefully this guide has helped you understand what to look for if you’re unsure exactly what type of boiler you have. If you have a problem with your boiler and need replacement parts or heating spares, make sure to use NBS. We provide high quality new and refurbished boiler spares and parts for a wide range of boiler models, brands, and types. Explore our online shop today to find the right parts for your boiler system.

With so many technological advancements over the years, there are now a number of different types of boilers from various brands, with their own designs and parts inside them. However, there are a few components that all boilers will have, which we will be exploring in this guide.

By understanding the basic boiler parts, it will make it easier if you have a problem with your system. You should never take the case off a boiler and try to fix it yourself. But if it has been checked by an engineer and you need a specific part. You will have a greater awareness of what you need and getting it at the best price from NBS. 

 

The main boiler components

There are a number of more detailed and intricate parts that go into most boilers which we will look at further into this article. For now, we want to cover the basics of a boiler system, the heat exchanger, combustion chamber, and burner. 

Heat exchanger 

The heat exchanger enables heat to be swapped between two substances within the boiler. Normally these are water and gas, without allowing them to mix together. A network of flues means water can be filtered around the combustion chamber and pressurises it. From here the pressurised water can be distributed to different areas in the house via pipes. Essentially, there will be hot gas and cold water at the start. But when it reaches the heat exchanger it changes to cooler gas and hot water. 

Combustion chamber 

The combustion chamber is typically made of cast iron as the temperatures within it can reach hundreds of degrees very quickly. It is the heart of the boiler, where the fuel and air are burned. Following the combustion process the heat is transferred to the heat exchanger for the surrounding water to be heated. 

Burner 

The burner is integral at the start of the heating process as it sends the signal from the thermostat to ignite the boiler. After this occurs, fuel will be sent to the boiler from an outside source via a filter mechanism (often a fuel tank). The nozzle on the burner then turns the fuel into a spray and creates a small flame or pilot light. Firing up the reaction in the combustion chamber. 

Storage tank (optional) 

Conventional gas boilers will often have a tank that can store water for long periods of time. Their precise sizes and diameters will be different depending on the size of the home it is in. Combi boilers don’t have storage tanks as water is heated on demand. So, it is sent to your taps, showers, and central heating as and when you need it. If you have a boiler with a storage tank, it’s important to check it occasionally for any potential leaks or other damage. By finding a small problem early you can prevent it from turning into a more serious issue further down the line.

 

Other important boiler parts

The above are the core elements that allow a boiler to function and heat up your house effectively. However, they aren’t the only important parts within the system. Below are some examples of other essential boiler components and their functions. 

Air pressure switches 

The purpose of the air pressure switch is to ensure that boiler works safely. It does this by making sure the fan gets rid of any waste gases through the flue before it allows the boiler to start up. 

Expansion vessels

The expansion vessel maintains a steady pressure in the system and works to stop any sudden changes in pressure from occurring. If the vessel doesn’t get enough air the pressure in the boiler will get too high. Equally if there is too much air, the system will end up with too much pressure. In both cases, water will leak from the relief valve. 

Boiler fan 

As you can probably guess based on the name, the fan in a boiler is designed to get rid of any toxic gases that are in your system. It works in tandem with the flue in order to remove the gases that have been released in the combustion chamber. The flue is the exit route, and the fan creates the draught needed to push the gases through it. 

Printed Circuit Board (PCB) 

The PCB controls all the electrical components of your boiler. Sending signals and allowing them to communicate with one another. If you have a problem with your PCB, it can shut down the boiler system completely and display the relevant error code. If you find that your boiler isn’t turning on at all, it could be that a problem with the PCB is to blame. It is a common cause that an engineer will check. 

 

Conclusion

Hopefully this guide has helped you learn more about your boiler and the integral components within it. That allow it to fulfil its purpose of heating your home and providing you with hot water. If you have a problem with a boiler part and need a replacement, NBS can help. We sell high quality new and refurbished boiler parts at affordable prices for our customers. 

Recycling boiler spare parts is beneficial for the environment as well as being cost effective for homeowners who need long lasting, working boiler components and heating spares. Our online shop has a wide collection of parts from many different boiler brands. You’re sure to find exactly what you’re looking for from us. Explore our boiler parts today. 

Combi boilers come with a lot of useful benefits for homeowners thanks to their compact design that heats water on demand instead of requiring a storage tank. You might think that this will negate the need to bleed your radiators like you would with a conventional boiler but unfortunately this is not the case. 

If you’re noticing that your radiators aren’t warming up properly, you’ll need to bleed the radiators to release the trapped air. In this guide, we’ll be exploring how you can bleed your radiators with a combi boiler, so you can always make sure that they’re working effectively when you need them. 

 

Why do you need to bleed your radiators?

There are a number of reasons why you might need to bleed your radiators, as mentioned above sometimes they can take longer than normal to heat up. Also, if the system is making strange noises or the radiator is hot at the bottom but cold at the top, these are other signs that your radiators require bleeding. 

Despite the key benefit of combi boilers providing water to your taps and showers at the same pressure as the mains, if you have trapped air in your radiators, it can cause too much pressure to build in your central heating system. As a result, your entire heating system can be left inefficient with hot water not being able to circulate as it’s meant to. Not only will this mean your home can take significantly longer to heat up than it should, but also it will be working harder and using more energy, leading to steep increases in your energy bills. 

 

When should you bleed your radiators?

You can bleed your radiators at any time of the year, especially if you are noticing any of the symptoms above. However, a lot of homeowners will bleed their radiators near the beginning of winter as the slightly colder temperatures will help you notice whether they are working properly or not. If you want to check the pressure in your system to determine whether you should bleed your radiators, look at the front of your combi boiler. 

There should be a gauge indicating the level of pressure that is in your system. The reading will be most accurate when the heating, taps, and shower are off, and it should be around 1.5 bar. If the pressure reading is higher than this, you will need to bleed your radiators to release some air and bring the pressure down to within a normal range. 

 

Steps for bleeding your radiators with a combi boiler

Turn the combi boiler on and up to the highest setting 

Wait until all your radiators are on and fully heated then check for signs of trapped air in any of them. 

Check for anything out of the ordinary 

If they start to feel cold anywhere or you hear unusual noises, note down where it is coming from, as these will be the radiators that require bleeding. 

Turn off the boiler 

Once you know which radiators need to be bled, you can turn off the boiler and wait for it to go completely cold before you start bleeding. This is because if you don’t you will end up with a stream of very hot water pouring out of the radiators, which is a serious burn risk to you and can make a lot of mess. 

Prepare the area for bleeding 

Locate your radiator bleed valve, which should be on the top or at the side of the radiator. Slot your radiator key into the valve and put a container underneath the valve. If you’re going to bleed multiple radiators, you should start with the one that is furthest away from your boiler and move closer to it as you go. 

Start bleeding the radiators 

Rotate the valve counter clockwise using the radiator bleed key or some other tool you have available in order to begin draining the radiator. A quarter to a half turn should be enough, but you will know if it is starting to bleed if you hear a hissing sound and air escaping. 

Close the valve when complete 

Use a cloth to secure a strong grip of the key and valve and to ensure water doesn’t spray out from the valve. When the water starts to reduce to a steady trickle, all the air from the radiator has been released and you should turn the key clockwise to close the valve. If any water has dripped down the radiator itself, make sure to wipe that off to prevent the risk of rusting. Repeat the process with all the radiators. 

Turn the heating back on 

When you bled all the radiators that needed it, turn your heating on again and check for cold areas or unexpected noises. If you’re still noticing some problems, you might need to bleed certain radiators again. 

Check the pressure gauge 

Combi boilers can lose pressure when you bleed the radiators, which means your gauge might show a reading off less than 1. If that’s the case, you will need to repressurise the system to get the pressure back up to normal. 

 

Where can I find combi boiler spare parts?

Bleeding your radiators is a good solution if you are noticing problems with your combi boiler system. However, if you have followed the steps above and are still experiencing issues you might want to contact an engineer who can check for what might be causing them. 

If it is confirmed that part of your boiler isn’t working as it should be, you can find high quality, affordable UK boiler parts at NBS. As experienced boiler spare parts suppliers, we offer a wide range of boiler parts from many brands so you’re sure to find the exact part you need with us. Explore our online shop today. 

When a boiler error code pops up and your home is left without hot water, it can seem like the world is falling. While this is a rarity for Vaillant boilers, it’s worth knowing what certain error codes mean and how to resolve them. 

Some boiler error codes can reveal issues that need heating replacement parts, boiler spares or a visit from an engineer. In these cases, shopping for boiler parts and spares is much more cost-effective option than getting a full boiler replacement. 

There are hundreds of possible error codes that your Vaillant boiler might display. However, in this blog we’ll just be covering the common ones people are likely to see in their homes.

 

What are Boiler Error Codes? 

A boiler error code signifies something has gone wrong which is preventing the boiler from working properly. They appear as alphanumerical (1-10 and A-Z) codes on the boiler display. 

In Vaillant boilers, error codes are divided up into categories that detail possible error types. These include: 

• Maintenance codes – When a maintenance code shows, it signals the boiler should be examined by a qualified engineer. The boiler will continue working while the code is displayed. 
• Blocking errors – these errors signal there’s a pump blockage in the boiler system that needs to be addressed. 
• Fault errors – usually shown as ‘F’ followed by a number. The number in the fault error relates to the system area that is experiencing the fault. 
• Locking errors – this occurs when the boiler displays a red flashing light, which shows that it has gone into lockout. Upon resolution of a locking error, boiler reset must be performed. 

 

List of Common Vaillant Boiler Error Codes 

F.29: No Flame Signal

This can be due to the flame going out or an error with flame detection systems. There can be many causes behind a loss of flame signal. This includes a broken gas valve, defective connecting/ignition lead or frozen condensate discharge pipe. Check the pilot light or flue duct to confirm an F29. 

F.28: Insufficient Gas in the System 

An F.28 error code prevents the Vaillant Boiler system from operating. It could be caused by other issues such as defective ignition leads, electrodes or electronic ignitors. For properties operating with a smart meter system, an F.28 error code can be displayed when the gas allowance runs out. 

F.22: Low Water Pressure 

There’s an insufficient amount of water in the system and/or a fault in the pressure sensor or ventilation system. Vaillant recommends topping up the water in a boiler once or twice a year to maintain pressure. This can be done easily on boiler systems with an auto feed. Oftentimes a boiler auto feed stops working and you need boiler parts and spares to replace it. 

F.24: Pump Fault 

An F.24 error can mean a boiler system is running with air as a result of an internal blockage problem. This can create further issues due to there being an uncontrolled ratio of air and gas. For combi boilers, homeowners can resolve the issue by pressing the heat control reset button. 

F.32: Fan Error

The fan speed in the boiler is either too high or too low. A simple restart should remove the F.32 error code. If not, professional help may be required as the issue may lie with the cable harness or a blockage. 

F.20: Temperature limit reached 

The boiler needs time to cool down and return to a reasonable operating temperature. A potential cause would be a faulty connection between the boiler and cable. 

F.61: Defective Gas Valve Control 

Issues might arise when a Vaillant boiler gas valve has been assembled incorrectly. Another possibility is the cable loom that connects to the gas valve has short circuited. New boiler parts can replace the gas valve in an attempt to solve the problem. 

NTC Errors: F.00/F.01/F.10/F.11/F.13 

All these codes reflect that a boiler’s Negative Temperature Coefficient Thermistor (Flow NTC) needs to be replaced, either due to damage or defectiveness. 

 

Find Vaillant Boiler Spares Near me

Many common Vaillant boiler error codes can be resolved with the relevant boiler spares. NBS have a large range of Vaillant boiler parts and spares available for delivery, wholesale, and distribution worldwide. 

Our prices are affordable so unexpected Vaillant boiler error codes can be fixed without any added stress. Get in touch today and find the boiler parts you need.