Quote:
Originally Posted by A930Rocket
^^^^ The water heater should have an expansion valve, where if the pressure builds up too high, it will flow out. That said, I suppose the valve could go bad. You can test it by lifting up the lever and hearing the water run out.
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Valves have gone bad but, the hissing means the valve is working. The problem there is eventually the value has to open wide if the pressure keeps building. You want to avoid a flood and/or a massive electric bill.
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Joe
See Porsche run. Run, Porsche, Run:
`87 911 Carrera