Different from the casing type boiler, when the domestic water is taken, the boiler is specially provided with a heat exchange plate, and the heating water passage is cut off by switching the electronic three-way valve in the boiler, so that the heated hot water forms a boiler in the boiler. Small cycle, through the plate exchange heat transfer to domestic water. Therefore, in the constant water temperature, the plate-changing boiler has certain advantages, and the service life is longer than that of the casing furnace.
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