Stiebel Eltron developed tankless electric water heating technology 90 years ago and continues as the industry pioneer and world leader. Our engineering excellence and high-quality manufacturing results in products fulfilling the highest expectations of performance and reliability. Thirty years of heat pump experience have taught us how to design a heat pump water heater to be as efficient as possible. The Accelera 300 extracts 80% of the heat it needs to make hot water from the energy in ambient air. We rely on the heat pump to make hot water, not on the back-up element. Heat pump draws only 500-Watt and every watt it uses generates 3 - 5-Watt of hot water. Over a year our 80 Gal. tank is more efficient than competing 50 Gal. tanks. In warm climates, the unit can be placed in a garage, where it uses the heat from the outside air; or inside the house, where it helps with air conditioning. In cooler climates, it is typically placed in a basement where it also dehumidifies the basement. Heat pump water heaters are not a new concept in Europe, and the Accelera 300, engineered and made by us in Germany, has been the largest seller there for 30 years. The Accelera 300?s ENERGY STAR energy factor is 2.51, the highest in the category.

Stiebel Eltron developed tankless electric water heating technology 90 years ago and continues as the industry pioneer and world leader. Our engineering excellence and high-quality manufacturing results in products fulfilling the highest expectations of performance and reliability. Thirty years of heat pump experience have taught us how to design a heat pump water heater to be as efficient as possible. The Accelera 300 extracts 80% of the heat it needs to make hot water from the energy in ambient air. We rely on the heat pump to make hot water, not on the back-up element. Heat pump draws only