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45 years of trusted expertiseMiscellaneous Cylinder Spares
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Essential for maintaining vented and unvented hot water systems, these miscellaneous cylinder spares include replacement immersion heater caps, blanking plugs, seal kits, sensor pockets, and mounting brackets. Suitable for direct repair or routine servicing, these components ensure water tightness and full electrical insulation across domestic and commercial cylinders.
Showing 31—60 items of 262
Routine maintenance and unexpected servicing on hot water storage vessels frequently require small, high-grade replacement fittings to prevent costly system leaks or electrical faults. Over time, rubber gaskets degrade under thermal stress, immersion heater wiring covers crack, and sensor pockets can corrode, risking water ingress into electrical housings or compromising temperature regulation. This selection brings together targeted hardware and structural spares designed for fast retrofit onto unvented combination units, open-vented copper cylinders, and thermal stores. Manufactured from heavy-duty brass, high-temperature polymers, and corrosion-resistant elastomers, these trade-grade parts withstand high static heads and continuous temperature cycles. Sourcing correct replacement seals, terminal covers, and adaptor fittings helps plumbing contractors complete quick first-time fixes, ensure strict adherence to G3 building regulations, and keep unvented hot water setups operating safely.
Frequently Asked Questions
How do I select the correct replacement gasket or seal for an unvented cylinder flange?
Selecting the right cylinder seal requires verifying the exact inner diameter, outer diameter, and flange bolt profile against the original manufacturer component. Unvented hot water cylinders operate under continuous mains pressure and high thermal loads, so using a generic washer or incorrect compound can lead to seal extrusion and water leaks. Always check whether the vessel requires an EPDM, silicone, or fiber gasket designed specifically for potable hot water applications, and clean the mating flange faces thoroughly to remove scale before fitting the new seal.
Why are replacement immersion heater terminal covers and caps necessary for site safety?
Immersion heater caps serve as the primary protective barrier over live electrical terminals, thermostat controls, and high-limit cut-out resets. Exposure to heat over several years can cause original plastic covers to become brittle, crack, or lose their secure fixing points, exposing 230V connections to moisture, dust, or accidental contact. Fitting a tough, fire-retardant replacement cover restores IP ratings, insulates electrical connections, and ensures the installation complies with current IET wiring regulations and electrical safety standards.
What is the function of a dry sensor pocket in a hot water cylinder?
A dry sensor pocket is a closed-end metal tube screwed directly into the cylinder wall, allowing temperature probes from boiler controls, solar thermal regulators, or heat pumps to be inserted without coming into direct contact with stored water. This design creates an efficient thermal transfer path to the probe while keeping the wet side of the cylinder completely sealed. If a sensor pocket becomes scaled or damaged during a probe change, replacing it restores accurate temperature sensing to the system controls without needing to drain down the entire hot water cylinder in future service visits.