you can also turn off the water valve to your hot water heater, let it sit for 15 minutes or so then turn it back on listening for leaks, trace all pipe runs from the water heater to the shower, sink, kitchen sink, and see if you find any signs of water leakage, it sounds like you are loosing a few gallons an hour, so it's kind of like leaving your sink dripping hot water, or is that the problem? does your sink drip?
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