Reply To: Leak from relief valve of hot water heater

[Wallingford Plm+HtgParticipant]

Any good service plumber responding to a leaking relief valve on a water heater will always check the incoming pressure first.I have never installed a expansion tank for a water heater and never will.If the incoming pressure is 80 psi or lower you will never have a problem with thermal expansion.Water pressure above 80 psi will cause problems with all parts of your plumbing system,not just your water heater.If the pressure is below 80 psi then you probaly just have a relief valve failure.