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In addition to boilermounted tankless

In addition to boiler-mounted tankless heaters, stand-alone units are available gas-fired instantaneous water heaters utilize a coil and heat exchanger to heat water as it's required like boiler-mounted units, instantaneous water heaters don't use energy to maintain the heat in a volume of water, but only fire as hot water is required a downside is that stand-alone units typically.

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