Fulton Electric Thermal Fluid Heater, Heater number 33931, 480 volt, 228 Amps, 60 cycle, 4-pass heater, Shell is 3/8" diameter, Heads are 5/8" diameter, HS 189 Square Foot. Includes a CS expansion tank. Expansion tank designed to mounted separate from the heater skid. Approx. dry weight is 2200 lbs plus expansion tank.