Water to water DC inverter Heat Pump: 1. -15 DC low temp. use 2.multifunction, cool ... : 407c, 410a, R221.Wide applicationWidely used in hotels,restaurants,apartment houses, villas, factories and schools, sauna, bathroom ... for various sizes of engineering, office buildings, hotels, restaurants, cinema, shopping plaza, gymnasium, hospital etc., as ... C~45°C. Water to water DC inverter Heat Pump