The MRCOOL MHK08U Universal Air Handler Heat Strip with Circuit Breaker is an 8 kW electric supplemental heating kit designed for compatible MRCOOL universal air handlers. It generates additional heat when outdoor temperatures reduce heat pump efficiency, helping maintain consistent indoor comfort. The built-in circuit breaker enhances electrical protection and simplifies installation. https://www.partshnc.com/mrcool-8kw-universal-heat-kit-mhk08u