For 2 major applications at a time. 97% thermal efficiency rating. 10 year warranty on heat exchanger. External temperature control knob. Thermal cut-out for safety. Flow sensor to provide a constant output temperature. Electronic flow switch. Weighs less than 25 lb. Fits virtually anywhere. No temperature/pressure relief valve necessary in most areas. Kilowatts: 26.85kW. Amps: 120 (3X40Amps), Phase: Single, minimum recommended service for the AE125 is 200A. Wire size: 8-gauge (6 conductors & ground). Water fittings: 3/4" MPT. Dimensions: 15.25" x 12.5" x 4.5". The unit will not provide an output temperature above 131 deg. F., 50 degrees F temperature rise = 3.7 GPM (gallons per minute). For more features and to download installation instructions go to www.boschotwater.com