Tempra and Tempra Plus models deliver output up to 140 degrees F and include heavy-duty electronics, a single-flow sensor, an easy-access hinged cover and a larger inlet filter screen. Tempra Plus models have a digital display for degrees F or degrees C readout, and Advanced Flow Control automatically adjusts flow rate to maintain setpoint temperature. The Tempra series is an ideal backup for solar thermal systems. All Stiebel Eltron tankless, on-demand electric water heaters feature a three-year warranty. www.stiebel-eltron-usa.com.