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This part may fit other MRCOOL® models or generations. Always verify your model number before ordering.
Send us your indoor unit model number, serial number, and photos of the existing part before ordering. This helps us verify compatibility and reduce the chance of ordering the wrong replacement part.
The MRCOOL UHK05 5kW Heat Kit provides dependable supplemental electric heat for MRCOOL Universal Series R-454B air handlers. This factory-approved kit includes a built-in circuit breaker and installs directly into compatible Universal indoor units for efficient cold-weather performance.
The MRCOOL UHK05 Electric Heat Kit is the ideal supplemental heating solution for Universal Series air handlers operating on the new R-454B refrigerant platform. Designed for seamless drop-in installation, this 5kW module enhances comfort in colder climates by providing fast, consistent electric backup heat.
Engineered by MRCOOL for perfect compatibility, the UHK05 includes an integrated circuit breaker, high-quality heating elements, and all required safety features. According to the Universal Series Heat Kit Installation Manual, the 5kW model integrates directly with select UAH-series air handlers and uses a single relay and breaker for reliable operation.
Whether you need auxiliary heat for cold snaps or full-time supplemental heating, the UHK05 delivers dependable performance aligned with MRCOOL’s Universal standards.
This 5kW heat kit is compatible with the following MRCOOL Universal Series R-454B Air Handlers:
| Brand | MRCOOL |
| Series | Universal R-454B |
| Model | UHK05 |
| GTIN | 00840255588041 |
| UPC | 840255588041 |
| Unit Type | Universal Series Heat Kit |
| Heater Capacity | 5kW |
| Voltage | 208/230V |
| Phase | 1 |
| Cycle | 60 Hz |
| Internal Protection | Circuit Breaker |
| Heater Amps | 18.0/20.0 A |
| MCA | 23.0/27.0 |
| MOP | 25.0/30.0 |
| Net Dimensions | 8.13" H × 10.63" W × 22" D |
| Net Weight | 4.5 lbs |
| Gross Dimensions | 10.25" H × 15" W × 25.63" D |
| Gross Weight | 12.1 lbs |
| Known Compatible Models / Series |
|
|---|---|
| Compatibility Notice | This part may fit other MRCOOL® models and generations. Compatibility outside the listed models is not guaranteed without verification. |
| Brand | Aux/Emergency Heat |
|---|---|
| MRCOOL® Part Number | UHK05 |
No common symptom information has been added for this part type yet.
This replacement part should be installed by a qualified technician or a capable installer familiar with mini split service procedures. Always disconnect power before servicing HVAC equipment.
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HEAT STRIP SIZING & PERFORMANCE
The correct electric heat strip size depends on more than air handler tonnage. Climate, home insulation, electrical capacity, system design, and heating demands all affect which heat kit is appropriate for your HVAC system.
Homes in colder climates often require larger auxiliary heat capacity because heat pumps lose efficiency as outdoor temperatures fall
Northern climates may benefit from larger backup heat kits than mild-weather regions.
Heat strips draw significant electrical current. Your panel capacity, breaker size, and wiring must support the selected heat kit.
Always verify electrical requirements before upgrading to a larger kW heat strip.
Poor insulation increases heat loss and can increase demand on both the heat pump and electric backup heat system.
Improving insulation may reduce heating costs more than increasing heat strip size.
Larger homes generally require more heating capacity, but square footage alone should not determine heat strip selection.
Heat load calculations are more accurate than simple square-foot estimates.
Drafty homes, large entryways, and poorly sealed structures can dramatically increase heating demand.
Air sealing improvements can significantly improve HVAC performance.
Heat strips are not universal. Each air handler has specific approved heat kit sizes and electrical configurations.
Always verify your air handler model number before ordering a heat strip.
Heat strips provide auxiliary and emergency heat when additional heating capacity is needed. Choosing the correct heat kit requires verifying air handler compatibility, electrical requirements, climate conditions, and manufacturer specifications.