... Hot Water 40-70°C;-Using groundwater, surface water etc open loop. or geothermal heat energy close loop etc. to ... and one way valve.HYDRAULIC CIRCUITBuilt with user side and source side water inlet/outlet connectors, water discharge connectors, air ... displayOPTIONALSight glass which must be installed in factory,Source side water flow switch,Source side water pump,Anti-vibration rubber,Metallic filter ...