Shower pump making loud noise
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Most likely cause & what to check
Shower pumps in UK gravity-fed systems are typically located in the airing cupboard, under the bath, or in a cupboard near the bathroom. They are notorious for transmitting noise through the structure.
Check the pump mountings — the pump should be sitting on an anti-vibration mat (a thick rubber mat). If not, fit one (£5–£15). This alone can dramatically reduce transmitted noise.
Check the pump pipework — copper pipes rigidly connected to the pump transmit vibration throughout the property. Flexible hose connections (Flexitank or similar braided hose) should be fitted between the pump and the copper pipework.
If the pump itself is making a grinding or clattering noise (rather than just vibration noise), the impeller bearings are failing. This typically means the pump is near the end of its life — replacement shower pumps cost £100–£300.
Check for air locks — a pump that runs dry or sucks air will make a loud rattling noise. Check the cold water tank level and ensure all connections are airtight.
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