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45 years of trusted expertisePressure Relief Devices
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Safely restore electric showers to full working order with our range of replacement pressure relief devices. We stock manufacturer-approved PRDs for leading shower brands to quickly resolve heater tank pressure faults on site.
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A blown pressure relief device (PRD) is a built-in safety mechanism designed to protect an electric shower heater can from catastrophic failure. When a blockage occurs down the line, such as a severely scaled showerhead or a kinked hose, the PRD activates and releases water from the bottom of the unit to relieve the internal pressure safely. Replacing a ruptured PRD is a straightforward task for a qualified installer, but sourcing the correct manufacturer-approved component is essential to ensure the shower remains safe and compliant. Our stock includes PRDs for all major UK electric shower manufacturers, allowing tradespeople to complete reliable first-time fixes. Always remember that replacing the PRD only solves the immediate symptom. To prevent the replacement device from failing immediately, installers must also diagnose and rectify the root cause of the back-pressure during the repair.
Frequently Asked Questions
Why does a shower pressure relief device blow?
A PRD is designed to activate when water cannot exit the shower unit fast enough, causing dangerous pressure to build up inside the internal heater tank. The most common culprits are a blocked or heavily scaled showerhead, a kinked or internally collapsed shower hose, or frozen pipework. You must clear the blockage or replace the restricted accessories before fitting a new PRD, otherwise the replacement will blow as soon as the shower is turned back on.
Are pressure relief devices universal across all electric showers?
No, pressure relief devices are not universal and are engineered to fit specific manufacturer models and heater can designs. You will need to identify the exact make and model of the electric shower to ensure you purchase the correct replacement part. Fitting an incompatible PRD can compromise the electrical and mechanical safety of the appliance while also invalidating the manufacturer warranty.
How fast can I get a replacement PRD?
We know that a broken shower is an urgent issue for homeowners, so we offer Free Click & Collect in as little as 5 minutes from over 350 City Plumbing branches nationwide. If you prefer to have stock delivered to site or your workshop, we also provide Free Next Working Day Delivery on orders over £75 ex VAT when placed before 5:00 PM Monday to Friday.