Temperature and pressure (T&P) relief valve on Reliance water heater is dripping or discharging water

Safety first: The T&P valve prevents tank explosion. Never cap or plug this valve or its discharge pipe.

Steps to check:

• 1. Check water temperature: Measure hot water temperature at a faucet. If above 140°F, address thermostat or gas control issues first.
• 2. Test incoming pressure: Use a pressure gauge on a nearby hose bib. If static pressure exceeds 80 psi, install or service a pressure-reducing valve (PRV).
• 3. Address thermal expansion: In systems with a PRV or backflow preventer, install or replace a thermal expansion tank sized for the heater. A failed expansion tank will cause frequent T&P discharge.
• 4. Inspect T&P valve: Lift and release the test lever briefly to flush debris. If it continues to drip after system pressure and temperature are corrected, replace the T&P valve with the correct rating (typically 150 psi/210°F).
• 5. Verify discharge piping: Ensure the discharge pipe terminates safely near a floor drain and is not blocked.

Warning: Persistent T&P discharge with normal pressure and temperature may indicate internal tank damage; consider replacing the heater.