The MRCOOL MHK15PB VersaPro Heat Kit with Circuit Breaker is a supplemental electric heating accessory designed to provide additional heat for compatible VersaPro air handler systems. It works by converting electrical energy into heat through resistance heating elements, while the integrated circuit breaker provides protection against electrical overloads. Designed for use with MRCOOL... https://www.partshnc.com/mrcool-versapro-15kw-heat-kit-mhk15pb