Bosch’s Greentherm C 1050 ES has an energy factor of 0.95, and is equipped with an automated and fully modulating bypass for domestic hot water temperature stability. The gas-fired water heater is 17.875” by 30-1/2” by 11-1/4” and weighs 74 lb. The unit comes with an active bypass that responds in real-time, providing exceptional temperature stability and hot water at the faucets. Features include: Inlet water filter, easy external access, venting options, and concentric up-and-out venting for single boilers and two to four unit single pipe cascades.