MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker - MHK08UMRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker MHK08U Provides emergency heat for your MRCOOL universal air handler. MRCOOL heat kit is the compatible heat kit model for MRCOOL MDUI18024 and MDUI18036 is capable of 25,001 30,000 BTU of heating capacity to keep you comfortable through the winter months. FEATURES: MDUI18024 is compatible with the 5 kW, 8 kW and 10 kW heat kits MDUI18036 is compatible with the 5 kW, 8 kW and 10 kW heat