The MRCOOL UHK15 Universal Series 15 kW Heat Kit is an electric supplemental heating accessory designed for compatible MRCOOL Universal Series air handlers using R-454B refrigerant systems. It works by converting electrical energy into heat, which is distributed through the air handler and ductwork to provide additional warmth when needed. Equipped with a circuit breaker, the kit supp... https://www.partshnc.com/mrcool-universal-series-15kw-electric-heat-kit-uhk15