Hot-water relief valve dripping: normal or a fault?
The temperature and pressure relief valve protects your hot-water system from excess pressure. A small release while the water heats can be normal; a constant flow is not.
Safety classification
Safe inspection only
This guide covers safe first actions only. It is not a licence to perform regulated work or enter a dangerous area.
What to do
- 1
Watch when it drips
A few drips while the system is heating can be normal. Continuous running or a steady stream points to a fault.
- 2
Keep clear of hot water
Discharged water can be scalding. Do not put your hand under the drain line.
- 3
Check the model and age
Photograph the data label from a safe position. Age and model help the plumber assess the valve and the system.
- 4
Follow the manufacturer's easing guidance
Many manufacturers recommend gently easing the relief valve lever at set intervals. Only do this if the manual says so, and stand clear of the discharge.
- 5
Book a licensed check
A plumber can test pressure, replace the valve or fit a pressure-limiting valve if mains pressure is high.
When to stop
- Water flows constantly from the valve
- The tank is leaking, rusted or bulging
- There is a gas smell or scorching around a gas unit
- Water is near electrical connections
Plumbing
Prepare the problem, safety status and location once. The matching category and service will be pre-filled.
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