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Usually it only does this if you were recently running hot water in a nearby faucet. I've seen this happen when the water heater is in the basement below the fixture in question and no water has been drawn at any fixture for a little while. After about an hour of no use, go down to the heater and feel the cold water line where it enters the heater. Is it warm or hot? How far up the cold water line is it warm? To a tee? Bingo. You need a "heat trap" to keep the heat from rising up the cold line. Repipe the cold line with a flex connector that turns 180 degrees back toward the heater then 90 degrees to horizontal (looks like a question mark).

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19y ago

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