Powerful output, compact design, remarkable energy-saving features. Our whole house electric tankless water heaters perform with the highest standards for comfort and reliability. Tempra plus models feature advanced flow control, patented in germany and exclusive to stiebel eltron tankless heaters. If hot water demand exceeds working capacity, advanced flow control automatically maintains consistent temperatures by slightly reducing flow. Intelligent self-modulating technology continually ensures the least amount of energy is used to heat the water. A tempra 12 plus provides hot water at a constant temperature for 1 bathroom in warm climates and for 1 bathroom at a cabin or cottage in cold climates. See sizing to determine which model is best 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 the performance and reliability of our products. features: tempra tankless electric water heaters must be correctly sized and you should consult the sizing guide to determine the correct model for you this tempra plus model has german patented advanced flow control that automatically reduces output flow to maintain temperature if demand temporarily exceeds capacity requires a minimum of 100 amp total service to the residence, with 1 separate dedicated 50 amp dp breaker and 8-gauge copper wiring for the tempra 12 plus itself requires 240 volt or 208 volt electric service, and has a maximum output of 12,000 watts at 240 volts or 9,000 watts at 208 volts supplies endless hot water at a constant and steady temperature from 68 to 140f (20-60c) that can be set on the front panel digital display flow rate you achieve from this or any tankless water heater depends on how powerful the unit is and the temperature difference between the inc