I don't know if this got mentioned yet or not, but the heat pump hot water heaters have a dehumidifying effect which makes the garage more comfortable in the warmer months (which is almost always).
Also the downside of the recirculating pumps is that if you go to get some nice refreshing cold water, it won't be as cold as you had hoped, and now you have to wait for the cold water instead of waiting for the hot...
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