... tube-in-tube and twisted inner tube designing. Specifications:1) Water side pressure: 1.5Mpa2) Refrigerant pressure: 3.5Mpa3) Inner tube ... heat pump8) Applications: condenser, evaporator, water-source heat pump, geothermal heatpump, water heater, air chiller, refrigerate equipment, HVAC, water chiller; whenthe material is corrosion resistant ...