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Is it necessary to have to adjustable pressure relief valve and a t&p valve on a gas water heater, or can this be bypassed?

  • Only if you like explosions. – Daniel Griscom Jul 28 '16 at 15:24
  • I'm not sure what an "adjustable pressure relief valve" is, but you definitely need a temp & pressure relief valve. It is a safety feature for if something goes wrong. – Zach Mierzejewski Jul 28 '16 at 15:51
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Yes !!! it is absolutely necessary to have a T&P valve to prevent the water heater from exploding if for some reason the pressure was to become to great and keep building. If the pressure in the water heater increase above the safe limit the T&P valve will open and allow some of the expanding water to escape out until the pressure reduces to a safe level, then the spring in the valve will close again.

I have not heard of an adjustable pressure valve for a water heater, Some home have a pressure regulator on the incoming water supply line so you can set (reduce) the water pressure to some other value than the incoming pressure from the city supply.

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