Reply To: Gas water heater pressure relief valve? Home › Forums › Public Forums › General Plumbing › Gas water heater pressure relief valve? › Reply To: Gas water heater pressure relief valve? 28 Jun 2003 at 2:20 am #294666 racefanoneParticipant Install a thermal expansion ball valve on the supply side of the heater .Ask your plumber about them.They are installed in place of an expansion tank and are approved to use.The ones I use are made by Watts.
