I have a hayward 400,000 BTU gas pool heater, the inspector said I need to install a 3/4 pressure relief valve in the heater,, but what size, there's a bunch of them/
drtom4444
Apr 20, 2012, 11:41 AM
It would screw into a 3/4" hole and you will have a temp to match on old pop-off valve. It should be no more complicated than that.