... at -20 degrees Celsius. The average COP in winter is up to around 4.5With the overall design, built-in almost ... stainless steel Plate exchanger. (316)3) Soft start control for single phase power supply models.4) Water flow switch equipped for water ... such as: high pressure, low pressure, overheating, overload ant freezing, phase order, discharge temp, etc.6) Flow switch for water flow ...