Favourites
Account
Basket
VAT:
Ex
Inc
45 years of trusted expertiseWater Heating Gaskets & Seals
Filters
Shop By
Type
Brand
Pack Quantity
Price
Please select your collection branch...
Please enter your delivery address...
Showing 1—6 items of 6
Maintaining the physical integrity of a water heating appliance relies heavily on using the correct replacement seals during routine servicing and component swaps. Our comprehensive selection covers everything from flange gaskets for immersion heaters to precision rubber O-rings engineered for internal valve connections. Using genuine OEM replacement parts ensures maximum compatibility with the specific appliance, guarding against premature degradation caused by continuous exposure to heat and mains pressure water. Whether you are addressing a slow weep on a commercial storage cylinder or completing an annual service on a direct water heater, having the correct gaskets on hand prevents frustrating call-backs and protects the surrounding property from water damage. Sourcing these essential spares from our nationwide network of over 350 branches allows heating engineers to tackle emergency leaks swiftly, restoring secure hot water delivery for customers without unnecessary delay.
Frequently Asked Questions
Do I need to replace the gasket when changing an immersion heater?
Yes, you should always fit a brand new gasket when installing a replacement immersion heater. The original seal will have compressed and hardened over time due to constant heat exposure, meaning it is highly unlikely to form a reliable watertight barrier if reused. Fitting a fresh, correctly sized gasket guarantees a secure seal against the cylinder boss and prevents slow leaks from developing under pressure.
Are water heater O-rings and internal seals universal?
While some generic O-rings might physically fit onto standard pipework connections, appliance-specific seals are almost never universal. Manufacturers design internal gaskets and seals to exact tolerances and specify distinct rubber compounds capable of withstanding the specific thermal and chemical conditions within their units. You must always cross-reference the appliance make and model to ensure you source the correct OEM part for a safe, permanent repair.
Why has the seal on my water heater failed prematurely?
Premature seal degradation is often caused by excessive system temperatures, over-tightening during installation, or a build-up of aggressive limescale in hard water areas. If a gasket is pinched or crushed because the installer applied too much torque, the rubber material loses its elasticity and eventually splits. To maximise the lifespan of replacement seals, ensure the mating metal surfaces are completely clean of debris before installation and tighten the component strictly to the manufacturer recommended torque settings.