... tube heat exchanger or plate heat exchanger.R22,R407C,R410A available,energy saving. FEATUREFunction:Freely being changed from ... 6, Heating+hot water(partial heat recovery)Refrigerant:R407C, R410a, R290, R134a, R22Characters:Anti-freeze thermos Water Source ... REFRIGERANT CIRCUITCopper tube connection with charge valves, filter, thermostatic expansion valve (capillary for mod. 4.5-14), gas-liquid ...