Check the listing for details. Low-Voltage Water Heating Element 12 or 24V. Condition: Open box. Listed at 109.00 USD. This water heating element is rated 600 watts and works with 12vdc or 24vdc voltages. Low-Voltage Water Heating Elements are used as diversion loads for solar, 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 TriStar PWM controllers to turn your excess power into hot water. They fit most electric water heaters 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 below to determine what each element will draw at various charging voltages.These elements have 1″ NPT male pipe threads.If your water heater tank is designed for square flange elements, use one square flange adapter for each element.