Electric Water Heater Commercial Water Heater Design Point-of-Use Tank Capacity - Plumbing 19.9 gal. Voltage - Water Heaters 240 Phase - Water Heaters 1 6000 Total Watts Overall Height - Water Heaters 25-1/8 In. Jacket Dia 19-3/4 In. Recovery @ 100 F Rise 24 gph Recovery @ 120 F Rise 20 Height to T and P Opening 19-3/8 In.