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Powerful output compact design and remarkable energy-savings. Tempra Plus models feature Advanced Flow Control patented in Germany and exclusive to Stiebel Eltron tankless heaters that automatically maintains desired hot water temperature by slightly reducing flow when necessary. Self-modulating technology ensures the least amount of energy is used to heat the water. A Tempra 20 Plus provides hot water at a constant temperature for up to 1 or 2 bathrooms in warm climates or 1 bathroom in cool climates. See sizing guide to determine the best model for you. Stiebel Eltron invented tankless electric water heating technology more than 90 years ago and is still the industry pioneer and world leader. Our engineering and manufacturing tradition of excellence means you can depend on our products to perform at the highest standards of comfort and reliability.