Using electricity as the driving source, utilizing factory waste heat resources (30 ℃~70 ℃), adopting high-temperature circulating environmentally friendly refrigerant as the medium, using efficient twin-screw compressors, and using pump heating technology to directly produce high-temperature hot water or low-pressure saturated steam (80-120 ℃), it can directly replace traditional coal-fired gas boilers. The unit has high energy efficiency, easy installation, and low operating costs.