Water source heat pump,4.5-75kw,changed freely from many running mode:cooling,heating,cooling/heating+hot water,hot ... 4.9kw-84kwtube in tube heat exchanger or plate heat exchanger.R22,R407C,R410A available,energy saving. FEATUREFunction:Freely being changed from ... 6 running mode as below, meet more requirements of clients.1, Cooling,2, heating, 3, hot water only,4, cooling ...