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I assume you mean hot water tank. The hot water tank was supposed to be the most efficient way to heat your water because heat rises. Since heat rises most of the heat energy would be absorbed by the water in the tank and very little of that energy would escape through the top of the tank. However; building scientists are now saying a direct hot water heating system is more efficient than a hot water tank because in a direct system you are not heating water until you need it, so you are not heating water you won't be using. If you frequently use hot water a hot water tank is the way to go. If you rarely use hot water a direct hot water (tankless) heating system is the way to go.

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17y ago

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