I bought this product to replace a conventional hot water heater. I live in an off-grid cabin and had to wait for at least an hour each time I wanted to use hot water. (Power and gas turned off every evening.) With this on-demand water heater, it takes about 90 seconds to get usable hot water. What a difference! The only hitch I had was the need to increase my well's water pressure just a little bit. But, I consider this a minor adustment that reaps great rewards.
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