Ask Pablo answers the unanswerable, such as this question: is it more efficient to get hot water by running the tap for a minute or heating the cold water on the stove? Surprisingly, the answer is to fire up the burner. Both heat loss in the pipes and the wasted cold water mean the stove's a better bet, even though the gas burner is less efficient than your hot water heater.
My one question to Pablo is, who the heck keeps their water heater in the garage? Not at my latitude!
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