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Your best bet would be an IR or instant read thermometer. You should test it from the closest faucet to the hot water tank, and make sure to let it run for several minutes first. If you do use a leave-in meat thermometer, it might take several minutes to get an accurate reading. Ice water should be close to 0C/32F (and if you add salt, it would get even ...


3

Your diagnostics so far point to the indirect hot water heater coil leaking potable water into the furnace loop as the most likely issue. You could perhaps verify if you can shut your hot water down for a few days (not convenient, I know.) Depending on the overall condition of the indirect water heater tank, the coil can often be replaced as a part, if the ...


2

The usual remarks about the safety of scalding water anywhere in your system go here. Physics says the life of your tank will decrease, but not enough for you to notice. Everything else being equal, hot water has a slightly higher pressure, but expansion tanks are there to deal with that very problem. The one place you might notice a difference is in ...


1

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 ...



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