Configured for cold climates or high flow rates. Well suited where incoming water temperature can drop below 45 deg. F. For use in more demanding water usage applications. Self-modulating flow-sensor technology regulates the amount of energy required to heat the water needed. Digital temperature display showing the outlet water temperature setting. Uses (3) 9 kW standard Emerson electric heating elements with brass tops to prevent electrolysis. Copper heat exchanger. Automatic resettable thermostat. (3) 40 DP breakers required. 112A draw. Required wire: 3 sets 8 AWG. Pipe fitting: 3/4" NPT. Energy factor: 0.998. UL and CSA certified. Dimensions: 17" x 17.75" x 4.25". Weight: 11 lb. Lifetime warranty.