Electric Tankless Water Heater Whole House Water Heater Application General Purpose 27 000/36 000 Watts Amps AC 3 x 60 Voltage 208/240VAC 1 Phase Min Flow Activation 0.77 gpm Temp Range 86 Degrees to 140 Degrees F Water Connection 3/4 in NPT Temp Rise @ 6.0 GPM 31/41 Degrees F Temp Rise @ 2.5 GPM 74/98 Degrees F Temp Rise @ 4.0 GPM 46/61 Degrees F Temp Rise @ 8.0 GPM 23/31 Degrees F Commercial Elements Copper Sheathed Housed in Cylinder Mounting Vertical