I bought a new GE water heater at Home Depot last year that is a gas heated 40 gallon model with the 12 year warranty. I installed it myself and it seems to work great and seems real efficient on its use of gas but every once and awhile I hear a phsst noise that I assume is the pressure relief valve letting off a little steam. After reading some other posts I" wondering if I have a bomb waiting to go off. According to the manual a back flow preventer would make it a closed water system which would prevent thermal expansion from bleeding back into the main supply line. As far as I know I don't have a back flow preventer. What could I do to fix this problem.
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