MRCOOL UHK20 Universal Series Heat Kit with Circuit Breaker 20 kW is an electric heating accessory designed to provide supplemental or emergency heat for compatible HVAC systems. It works by using electric resistance heating elements to generate warm air, while the integrated circuit breaker provides electrical protection during operation. Designed for use with compatible MRCOOL Unive... https://www.partshnc.com/mrcool-universal-series-20kw-heat-kit-uhk20