How much does it cost to replace a boiler expansion vessel?
Boilers in most domestic settings have an expansion vessel, which is an internal part for the maintaining of adequate pressure. This serves a dual purpose of ensuring the boiler can function, as well as ensuring heating is provided safely. In this piece, we examine how much a replacement expansion vessel will cost when it is needed.
What does an expansion vessel do in a boiler?
The main function of a boiler expansion vessel is to prevent damage to internal components from excessive pressure build up. This boiler part maintains a stable boiler pressure as the water increases and decreases in temperature. This function is crucial, as the heating and cooling process occurs regularly in boilers which will lead to changes in pressure unless compensated.
Expansion vessels counteract pressure increases by compressing the air in the expansion vessel chamber, thereby stopping hot water from rising. This part should last a long time, only suffering fault due to rust or failure of the diaphragm of the vessel. When this happens, it is necessary to source and replacement to make sure the boiler is operating safely.
Cost of replacing a boiler expansion vessel
The typical expansion vessel consists of two chambers separated by a thin rubber seal, known as a bladder vessel. One chamber contains nitrogen or another inert gas, and the other contains water from the elsewhere in the heating system.
Replacing a boiler expansion vessel can incur a range of costs, from £25 at the low end to more than £100 at the high end. The exact price will vary depending on the brand and make of the boiler. However, there are also some additional factors which can impact the overall cost of replacing an expansion vessel depending on the property and the demands on the boiler.
Factors that can affect the cost of an expansion vessel
It’s required that a qualified heating engineer perform the replacement to ensure it’s been completed properly and comply with safety standards.
Higher quality boiler expansion vessels will cost more to buy and can potentially be more complex to install.
Depending on where the parts and materials are being sourced, there could be higher costs due to market conditions.
Replacing an expansion vessel might require the purchase of additional materials. This can include piping, valves, or other fittings.
New and replacement boiler parts
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