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A plate heat exchanger unit is a heat exchange device composed of a plate heat exchanger, circulation pump, make-up water pump, valves, pipe fittings, filters, instruments, and an electrical control system, which can be installed on the same base. It boasts advantages such as a compact structure, small footprint, easy installation, high efficiency, energy savings, as well as intelligence and automation. Once the heat exchange unit arrives at the installation site, it only needs to have its primary and secondary sides along with the make-up water pipes connected, and power supplied, before it can start operating. Applications: It is widely suitable for various applications that require heat exchange, such as heating, air conditioning, water supply for bathing, domestic water use, water for swimming pools, and process water use in civil buildings like factories, government offices, schools, residential complexes, and villas, as well as in commercial buildings such as shopping malls, guesthouses, and hotels. Working principle: The plate-type heat exchange unit automatically and continuously converts the heat obtained from the primary water network into water suitable for domestic use and heating. Under the control of the temperature control valve, steam or hot water enters the plate heat exchanger from the primary side inlet of the unit at a flow rate required by the heating system. The heat exchanger heats the heating (domestic) return water of the end users through indirect heat exchange, and then the heated water flows out from the primary side outlet of the unit ； The return water on the secondary side first passes through a filter to remove dirt, and then is pumped by the secondary side circulation pump into the heat exchanger where it is heated by steam or hot water before being supplied to users for use in generating hot water at various temperatures for heating, air conditioning, or domestic purposes. After entering the plate heat exchanger, steam or hot water turns into condensed water or hot return water, which then returns to the heat source to complete the circulation within the primary and secondary heating systems. The primary heat medium returns to the primary heating network after heat exchange in the plate heat exchanger unit. The water loss in the system is automatically replenished by the make-up water pump at a set pressure, ensuring stable system pressure and normal operation.