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Expansion Tank

Posted by Raymond VinZant Plumbing Prof on February 10th, 2003 02:22 PM
In reply to Water Heater Pressure Relief Valve by Jeff on February 10th, 2003 02:15 PM [Go to top of thread]

The problem exists, because there is a check valve on the incoming line from the drill point in the ground. The water needs a place to expand. An expansion tank will take care of the problem, but I would also suggest checking the existing well expansion tank. Either the bladder is no good, or there is not enough room in the bladderless tank for air compression.
As water heats up, it expands, in a closed well system, it blows the p&t valve. An expansion tank absorbs the expansion.
Good Luck

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