I want to replace my water expansion tank and I just found out that it is installed in the hot water pipe coming out from the water heater. From what I've read, it should be installed in the cold water supply. I want to know if this will cause any problems
Water – Will having an expansion tank on the hot water pipe cause any problems
heaterwater-heater
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Best Answer
The only 'problem' is that it fills with hot water. The water sits there and will get cold if not being used.
When the hot water is turned on again, this cooler water will mix with your hot water.
Your hot water will change in temperature a bit until the water in the tank, and the metal of the tank get hot.
Nothing will happen that will ruin your plumbing.