... heat from the air, and transfers the heat into the water. It can still work when the air temperature is -5oC ... , and provide 60oC hot water. Features:1. Environment friendly: no air pollution, low energy consumption ... for Hotels, Villas, Hair Salon, Foot Massage, etc; hot water source for swimming pool, factory , farm, etc.6. Heating capacity: 18kw,35kw ...