The MRCOOL MHK20U Universal Air Handler Heat Strip with Circuit Breaker is a 20 kW electric heating accessory designed for compatible MRCOOL universal air handlers. It works by converting electrical energy into heat, delivering reliable supplemental or primary heating during colder conditions. The integrated circuit breaker enhances electrical protection and supports safe operation. https://www.partshnc.com/mrcool-20-kw-universal-air-handler-heat-strip-with-circuit-breaker-mhk20u