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How can I balance the hot water temperature in my two bathrooms?
The newer, indirect water heaters are supposed to regulate temperature within +/- 2 degrees of set point. If you are having fluctuating temperature in only one area of the home, it usually is due to a more localized problem. Most commonly, the culprit is a single handle tub or shower mixing valve. There can be some other causes. The best thing to do is to have a licensed plumbing contractor look into the problem to locate the source of your problem.