At National Boiler Spares, whether you’re replacing a worn thermocouple or upgrading your system, our selection of high-quality thermocouples guarantees reliability and optimal operation.
Thermocouples are critical components in any heating system, ensuring safe and efficient operation by detecting the presence of a flame. These devices work in conjunction with other system parts to monitor the burner, prevent gas flow in the absence of a flame, and maintain consistent heating performance.
Worn or malfunctioning thermocouples can cause significant issues and inefficiencies in your boiler. Common signs that a thermocouple may need a replacement include:Â
- The pilot light not staying lit
- The boiler shutting off unexpectedly
- The system failing to ignite
Buy thermocouples online
National Boiler Spares stock a wide range of boiler gas valves for many brands and manufacturers including Baxi, Worcester, Vaillant, Ideal, Glowworm and more. Try using our search bar above to find your specific boiler thermocouple by parts or GC number with ease.
Why Choose National Boiler Spares?
Here at National Boiler Spares, we are a trusted source of high-quality boiler spare parts and heating components to customers throughout the UK and beyond. Our comprehensive range of new brand genuine parts covers the latest and older model boilers, all available at the best possible prices online or over our trade counter. We work closely with our suppliers to ensure that we always have the latest and most innovative products available, and we are constantly expanding our boiler spares and parts range to meet the evolving needs of the industry.Â
Thermocouple – FAQS:Â
What is a thermocouple, and how does it work?Â
A thermocouple is a safety device used to monitor the temperature of the pilot flame. A thermocouple generates a small electrical current when it detects heat from the burner flame, which keeps the gas valve open. If the flame goes out, the thermocouple stops generating the current, causing the gas valve to close, preventing gas leaks and unsafe operation.
How often should a thermocouple be replaced?
Thermocouples usually last 5-10 years, however they should be replaced when they show signs of failure or during regular maintenance if they are worn or corroded.
What causes thermocouples to fail?
Thermocouples can fail due to several factors, including:Â
- Normal wear and tear: constant exposure to heat weakens the thermocouple over time
- Corrosion: exposure to moisture or corrosive gases can degrade the metal
- Dirt buildup: build up on the thermocouple can prevent proper heat detection
- Overheating or mechanical damage: excessive heat or physical impact can impair functionality
- Poor positioning near the flame: incorrect or loose positioning can cause thermocouple failureÂ
What’s the difference between a thermocouple and a thermistor?
A thermocouple detects the presence of a flame and ensures gas flow is safe, whereas a thermistor measures and regulates temperature in the boiler system.
How can I maintain my thermocouple?
Maintain your boiler’s thermocouple by keeping it clean from debris, checking for damage, and ensuring proper alignment with the flame. Include it in routine boiler maintenance and replace it if worn or faulty for safe operation.Â
