These low-voltage water heating elements are used as diversion loads for wind or hydroelectric systems. Use one or more of these heating elements with a charge controller designed for load diversion, such as the Xantrex C-40 or C-60, or the Morningstar TS-45 or TS-60 to turn your excess power into hot water. They fit most electric water heathers with screw-in elements. One model is available for 12 and 24 VDC systems and another for higher power 24 and 48 VDC systems. Each unit has two elements that can be wired in series, parallel, or used individually, depending on voltage and desired current draw. See table to determine what each element will draw at various charging voltages. If our water heater tank is designed for square flange elements, use one square flange adapter for each element. 1" male pipe threads. 2-year warranty.