Completely Redesigned. The Tempra® series has been redesigned completely inside and out - upgraded heavy-duty electronics, a simple single flow sensor design, a hinged cover for easy access, and Advanced Flow Control™ for the Tempra® Plus. Welcome to the next generation of German quality. Unlimited supply of hot water. The Tempra® continually heats water instantaneously as you require it -and only when you require it. The Tempra® unit completely replaces a conventional tank heater with no disruption to your comfort and hot water needs. Advanced Flow Control™ Advanced Flow Control™ ensures the temperature remains constant no matter what! Tempra Plus featuring Advanced Flow Control The Tempra® Plus is the most technologically advanced tankless water heater available on the market today. Advanced Flow Control is exclusive to the Tempra® Plus and ensures a constant temperature output no matter how great the hot water demand is. Advanced Flow Control technology works by automatically adjusting the flow of water to eliminate unpleasant temperature fluctuation. What that means to you is a consistently satisfying experience every time, all the time ! Save energy and reduce your electric bill. Electric tank type water heaters are subject to stand-by losses which amount to 15 - 20% of the kWH used. In addition, water in a tank has to be heated hotter than necessary to account for these stand-by losses. Changing to a tankless system like the Tempra® eliminates these problems and results in typical savings of at least 15 - 20% on the hot water portion of your electric bill. Control temperature simply by setting a dial. Set the knob on the front cover and enjoy water temperatures between 86°F (30°C) and 140°F (60°C). Change the desired temperature at anytime. Advanced microprocessor technology ensures that the water temperature never deviates from the set point. Free ground delivery. Express delivery extra.