Old 01-23-01, 02:00 PM
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I have a gas water heater that has just started making a loud 'whistling' sound. It sounds just like steam escaping from a teapot. The sound stops when I fill the bathtub or use a significant amount of hot water. Then it starts back again. There doesnt appear to be any water leaking or gas leaking. Someone told me it could be a leaky pressure relief valve. Should I change it? Thanks
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Old 01-23-01, 02:11 PM
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Check the pressure at the water heater drain valve with a pressure gauge

If the pressure is 150lbs or more the T&P valve will trip, the reason the this high pressure is when watre heats it expands, adding pressure to the system, to keep the pressure from building install a thermo expansion tank

So check that pressure before you change the T&P Valve.

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