... many running mode:cooling,heating,cooling/heating+hot water,hot water only. Water Source Heat Pump multi-function typeCooling Capacity 4 ... CIRCUIT Built with user side and source side water inlet/outlet connectors, water discharge connectors, air vent valve, mod.4. ... side is complete also with expansion vessel, water pump and water flow switch.ELECTRIC PANELconsists of:Compressor contactor,Compressor ...