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Difference between Tank and Tankless water heaters
Tank water heaters utilize a single-pass heat exchanger. Heat is produced from the bottom, then rises through 50-100 gallons of cold water and exhausts through the top. Heat and energy is transferred just once and wasted in the form of high temperature fumes.
Cold water is deposited from the top and rests at the bottom, resulting in sediment build-up that erodes efficiency, durability and performance with each use. The design limits a tank’s ability to produce endless hot water.
Tankless water heaters also exhaust heat with a single-pass process. Heat produced by the bottom burner rises through slow moving cold water. Heat and energy is transferred just once and wasted in the form of high temperature fumes similar to a conventional tank. Water pressure is reduced as water winds through the coiled copper heat exchanger and the copper pipes eventually fail due to scale build-up. The design limits the ability of the tankless to provide consistent hot water to multiple applications. (Yearly descaling required on tankless water heaters.)
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