In particular, the present invention relates to a lukewarm water heater having a structure that can be moved while being able to immediately supply hot water of an appropriate temperature in which detergents can be easily dissolved, and a hot water tank 21 and a washing liquid tank installed spaced apart from the hot water tank 21 ( 22) and cold water supplied from the outside, some of which is transferred to the hot water tank 21 to heat it, and the rest is mixed with hot water heated in the hot water tank 21 to form lukewarm water, which is the intermediate temperature between hot water and cold water. A pipe part configured to discharge and discharge, a main pump 40 for transferring cold water and hot water by driving the pipe part, a heater 211 and a main pump 40, and a controller for controlling one or more valves installed in the pipe part, and , By being composed of the case part 10, it is compactly manufactured so that the occupied space is small as much as possible, so that the consumption of power or fuel can be minimized while the consumption of power or fuel can be minimized, and lukewarm water can be immediately supplied with only minimal fuel or power consumption. We want to provide lukewarm water heater
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