The Stiebel Eltron Accelera 300 heat pump water heater can extract up to 80% of its energy requirements from the energy in the air around it. The compressor and fan consume only 1kWh of electricity to generate the heat equivalent of 3-5 kWh. The Accelera features a large 80-gallon capacity, a 2.51 Energy Factor, a 78-gallon first-hour rating and the lowest power consumption (1,739 kWh/year) as determined by DOE testing. The Energy Star-certified water heater features a 10-year warranty.

Stiebel Eltron.