X
Promo Image

Receive 10% off your first order!

Sign up for exclusive special offers and updates straight to your inbox

    By signing up, you agree to recieve email marketing from National Boiler Spares. Discount codes cannot be used when purchasing boilers.
    No Thanks

    Shop

    Generic filters
    Exact matches only
    Search in title
    Search in content
    Search in excerpt
    Filter by Product Brand
    Filter by Product categories
    Home < Diaphragms

    Diaphragms

    Boiler diaphragms are a crucial part when maintaining the efficiency and safety of your heating system. These components are typically found in the diverter valve, expansion vessel, or even the water section of a boiler and help regulate pressure and flow within the system. Diaphragms can wear out over time, which leads to leaks, a loss of pressure, or heating inefficiencies, this makes timely replacements very essential.

    Top Brands Covered

    We offer diaphragms for popular boiler manufacturers, such as:

    Why Replace Your Boiler Diaphragm?

    Faulty diaphragms can lead to pressure fluctuations, affecting the performance of your heating system. A damaged diaphragm may cause leaks which could potentially result in costly repairs if they are not addressed. Keeping diaphragms in good condition will help maintain your boiler’s energy efficiency and ensures safe operation.

    Boiler Diaphragm – FAQs

    What is a boiler diaphragm?

    A boiler diaphragm is a flexible membrane located in components such as the expansion vessel or diverter valve. It helps regulate water pressure or direct the flow of hot water in your boiler system.

    How often should a boiler diaphragm be replaced?

    A boiler diaphragm typically lasts between 5 and 10 years, depending on usage and water quality. However, if you notice any signs of malfunction, it may need to be replaced sooner.

    Can I replace a boiler diaphragm myself?

    Replacing a boiler diaphragm can be complex and may require specific tools and knowledge. It’s recommended to hire a qualified Gas Safe registered engineer to ensure the replacement is done safely and correctly.

    How do I know which diaphragm is compatible with my boiler?

    Check your boiler’s manual for part specifications or search using your boiler’s make and model number. Our product descriptions typically list compatible boiler models for each diaphragm.

    Can a faulty diaphragm affect both heating and hot water?

    Yes. In combi boilers, a faulty diverter valve diaphragm can prevent hot water from being directed properly, leading to issues with both heating and hot water.

    How do I know if my boiler diaphragm is faulty?

    Signs of a faulty diaphragm include:

    • Loss of pressure in the boiler
    • No hot water or inconsistent heating
    • Water leaks near the expansion vessel or diverter valve
    • Strange noises coming from the boiler