12 Volt 300 Watt 9 3/8 Inch DC Submersible Water Heating Element Fits standard water heaters with a 1" NPT or your own custom heater tank The surface load of the heating pipe is 2W/cm Can be used direct with batteries, solar panels, hydroelectric generators, as a wind turbine dump diversion load Standard American water heater element replacement for on or off grid applications Stainless steel materials