This part heats the water during wash cycles. This part does NOT come with installation instructions. This original LG Washing Machine Heater With Thermistor originally shipped with the following LG devices: WM3670HWA, WM2487WHM, WD13517BDA, WM3550HWCA This is a true LG part! This item is NEW! Don't see your model number? Send us a message as we are happy to help!