Quote:
Originally Posted by nn0wheremann
So, why do you need all that and a pressure relief valve and pipe that drains into the pan under the water heater, and then outside the house via the pan drain? It all seems redundant to me.
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The pressure relief valve on the hot water heater is designed to prevent an explosion by opening at about 150psi. The expansion tank is designed to maintain the pressure in your lines at about 60psi.
The pressure in my lines did not get high enough to open the pressure valve though it did get high enough to cause the shower to leak. While it was not high enough to risk a tank explosion it was high enough to put additional stress on all the pipes, fittings, joints, and valves in my house. It probably/hopefully did not cause damage but it could have. A working expansion tank that keeps the pressure near normal prevents that additional stress.
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Victor, NY - Randallstown, MD - Yakima, WA - Stevensville, MD - Village of Hillsborough
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