It obtains great amount of heat from air, free of charge. Consumption of 1 kWh makes energy over 6 kWh available, to save 70~90% of your electricity fee. Fully automatic control is used and no specialized person is needed for its operation. The device can be installed in garages, balconies and etc. Without need of construction area, so to save investment on civil engineering. Dimension: 720 x 675 x 870; Technical parameters: Rated generation of hot water: 180 L/h Rated heat generation: 8.2 kW Rated input power: 2.1 kW Rated input current: 11 A Maximum input power: 3.4 kW Maximum input current: 16 A Rated water temperature: 55C Maximum water temperature: 65C Size of connecting pipe: DN20