... cooling,heating,cooling/heating+hot water,hot water only. Water Source Heat Pump multi-function ... Heating+hot water(partial heat recovery)Refrigerant:R407C, R410a, R290, R134a, R22Characters:Anti-freeze thermos Water Source Heat Pump use underground water or circulated water or brine as main sources. Water source heat ... water and power supply only. Suitable for installing in outspace such as roof, floor ...