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The unattended double-tube heat exchanger unit is a complete set of heat exchange equipment that offers advantages such as energy efficiency, low investment costs, small space requirements, easy installation, and reliable operation. It is used for heating, bathing, and air conditioning systems in residences, government offices, schools, factories, and other facilities, and it can facilitate heat exchange between steam and water as well as between water and water. Users need to connect pipes and power supplies in order to use it. Equipment features: 1. It uses industrial computing or unattended temperature controllers to ensure unattended control of the water supply temperature; that is, the water supply temperature can be adjusted according to pre-set programs in response to the outdoor temperature, the temperature in the designated room, and time, resulting in high heating quality and energy savings. 2. The industrial computer displays, stores, and prints various operating parameters, including: heat transfer fluid flow rate, heat transfer fluid temperature, heat transfer fluid pressure, heat supply amount, outdoor temperature, indoor temperature, water supply temperature, condensate water temperature, water supply pressure, etc. 3. During soda water heat exchange, a condensate heat exchange section and condensate temperature control are provided to utilize the heat from the condensate. 4. The system uses variable-frequency control for automatic voltage stabilization. 5. Combine the condensate tank, expansion tank, and tank into one unit. 6. The use of SH double-tube heat exchangers results in a compact unit size and reduced floor space requirement. 7. It comes with a membrane-based water softener tank, and tap water can be used. 8. The water pump can operate with variable frequency and variable volume. 9. Standard modular design allows users to select the control functions based on their specific needs, thereby reducing investment costs. The operating parameters are displayed digitally, which is convenient.