Commercial/Industrial High Capacity Tankless Water Heaters Specially engineered for heavy industry, our models can meet the rise and flow needs of nearly any factory, distillery, laboratory, gym, or growhouse in North America. To meet our customers’ needs, we offer both constant (hot-start) and variable (cold-start) temperature models. Our C Series water heaters are available in sizes from 12 kW to 144 kW, in common 3-phase voltages, including 208V, 240, 480, 480 Wye and 575V**.