The MRCOOL UHK10 Universal Series Air Handler Heat Kit is a 10kW supplemental electric heating assembly designed for R-454B Universal Series air handlers. It works by converting electrical energy into heat through resistance heating elements, while the air handler’s blower distributes the warmed air throughout the ductwork. https://www.partshnc.com/mrcool-universal-series-10kw-heat-kit-uhk10