MrCool 15 kW Electric Heat Kit – For VersaPro Heat Pump Package Units, Auxiliary/Backup Heat (MHK15PB)
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Key features
- 15 kW resistive electric heat output, approximately 51,000 BTU supplemental capacity
- Factory-matched accessory for MrCool VersaPro heat pump package units
- Functions as auxiliary and emergency backup heat during cold weather or defrost cycles
- Designed for direct installation into the VersaPro package unit cabinet
- Resistive electric element converts electricity to heat at 100 percent efficiency
- Requires a dedicated high-amperage circuit; electrical panel work is part of the installation scope
About this system
The MrCool MHK15PB is a 15 kilowatt electric heat kit designed specifically for MrCool VersaPro heat pump package units. It functions as auxiliary or backup heat, kicking in when outdoor temperatures drop low enough that the heat pump alone cannot meet the load, or when the system is in defrost mode. At 15 kW, it produces roughly 51,000 BTU of supplemental heat, making it appropriate for larger packaged units or climates where hard freezes are common. This is a resistive electric heating element, not a standalone heat source, so efficiency in the traditional AFUE or SEER2 sense does not apply here. It converts electricity to heat at essentially 100 percent, which is standard for all electric strip heat.
This kit is a factory-matched accessory, not a universal part. It is engineered to slot into compatible VersaPro package units and communicate correctly with the system controls, which matters for safe operation and proper defrost staging. Homeowners who already own a VersaPro package unit and are adding or replacing the heat strip will find the physical installation relatively straightforward if they are comfortable with electrical work, but 15 kW at typical residential voltages draws significant amperage and requires a dedicated, properly sized circuit. Anyone without confidence in panel work should hire a licensed electrician for that portion of the job even if MrCool’s broader ecosystem is designed with the DIY installer in mind.
The MHK15PB does exactly one job: provide supplemental electric resistance heat inside a VersaPro package unit, and for owners of that specific system it is the correct factory-matched part. As a resistive heat strip it carries no efficiency advantage over any competitor, so value comes down entirely to fit, price, and whether MrCool's limited service network is acceptable risk for your situation.
Overall score is the average of the five ratings above.
What we like
- Exact factory fit for VersaPro package units eliminates compatibility guesswork
- Straightforward cabinet installation for someone comfortable with electrical work
- Provides reliable backup heat when the heat pump cannot keep up in extreme cold
- Resistive electric elements have very few moving parts and a low mechanical failure rate
- Priced competitively compared to OEM heat kits from premium packaged unit brands
Trade-offs
- Resistive electric heat is the least efficient heat source per dollar of energy consumed, raising operating costs on the coldest days
- MrCool warranty claims are documentation-heavy and owners report aggressive denial of coverage
- Local HVAC technicians familiar with MrCool systems are scarce, leaving troubleshooting largely on the owner
- Customer service response times are slow and resolution is often handled through email rather than live support
What homeowners and pros say about MRCOOL
Homeowners who have posted reviews of MrCool VersaPro accessories, including heat kits, tend to reflect the same pattern seen across the broader MrCool lineup. Home Depot owner reviews for popular MrCool DIY products cluster around 4.5 out of 5, with easy self-installation cited most often as the reason for satisfaction. For a heat strip that drops into an existing cabinet, installation praise is reasonable, though buyers consistently note that the electrical rough-in is the one step where professional help is worth the cost. MrCool’s fifth-generation products show markedly better early reliability than third and fourth generation units, with roughly 85 percent of 5th-gen systems running reliably past year one compared to failure rates near 25 percent in earlier generations. A heat kit with few moving parts should, in principle, be among the more durable items in the lineup.
Where owners and HVAC professionals push back on MrCool as a brand is the support infrastructure surrounding any failure. Documented complaints point to long hold times, email-only troubleshooting, and a warranty claims process that owners describe as looking for reasons to deny rather than approve coverage. For a heat strip this matters most if the element itself fails or if there is a control-board interaction issue, because finding a local technician familiar enough with MrCool VersaPro equipment to diagnose it quickly is genuinely difficult. Few independent HVAC contractors stock MrCool parts or have hands-on experience with the VersaPro line, which means a failure scenario often falls back on the owner to self-diagnose using MrCool’s email support. Buyers who are comfortable in that self-reliant role and already own the VersaPro system will find this the correct and reasonably priced part; buyers who want a phone call and a truck in the driveway should factor that gap into their decision.
Sources: Better Business Bureau MRCOOL reviews, PickHVAC MRCOOL review, AHRI Directory of Certified Product Performance, U.S. DOE appliance and equipment efficiency standards.
How it compares
| Brand | Comparable model | SEER2 | Stage | Price position |
|---|---|---|---|---|
| MrCool | MHK15PB VersaPro 15 kW Heat Kit | N/A (heat kit accessory) | N/A (resistive electric strip) | Value pick |
| Carrier | KFCEH3101N15 15 kW Electric Heat Kit (WeatherExpert/48 Series compatible) | N/A (heat kit accessory) | N/A (resistive electric strip) | Moderately higher; dealer-supplied OEM part |
| Trane | BAYEVAC15BK 15 kW Electric Heat Kit (YCC/YCD series compatible) | N/A (heat kit accessory) | N/A (resistive electric strip) | Moderately higher; typically sourced through Trane dealer network |
| Lennox | ECB29-15CB 15 kW Electric Heat Kit (Elite/Merit packaged unit compatible) | N/A (heat kit accessory) | N/A (resistive electric strip) | Moderately to significantly higher; contractor-channel pricing |
Competitor rows are comparable single-stage units at similar efficiency; price is relative position, not a quote.
Questions about this system
Will this heat kit work with any MrCool unit or only the VersaPro package units?
MrCool specifies the MHK15PB exclusively for VersaPro heat pump package units. It is not a universal heat strip and is not designed for MrCool's ductless mini-split or DIY series. Installing it in an incompatible unit could create a control or safety issue.
What circuit size do I need to power a 15 kW heat strip?
A 15 kW element at 240 volts draws roughly 62.5 amps, so most installations will require a dedicated double-pole breaker in the 70-amp range plus appropriately rated wire. Check the MHK15PB installation manual for the exact minimum circuit ampacity and always have a licensed electrician confirm your panel can support the load.
How does MrCool's warranty actually work if the heat kit fails?
MrCool's warranty process is documentation-heavy and owners of other MrCool products report the company looking closely for reasons to deny claims. Keep your purchase receipt, installation records, and any correspondence. If you need a repair, be aware that few independent HVAC technicians are familiar with MrCool equipment, so troubleshooting often falls back to the owner following email guidance from MrCool support.
How often will the heat strip actually run compared to the heat pump?
On most days above roughly 35 to 40 degrees Fahrenheit the heat pump handles the load and the strip stays off. The strip activates during the heat pump's defrost cycles and on nights when outdoor temps drop below the heat pump's efficient operating range. Running it frequently on very cold nights will noticeably increase your electric bill because resistive strip heat costs two to three times more per BTU than the heat pump itself.
Can I install this heat kit myself or do I need a contractor?
The physical installation of the element into the VersaPro cabinet is within reach for a handy homeowner who has read the manual carefully. The electrical connection, however, involves high-amperage wiring and panel work that most local codes require a licensed electrician to complete. Even if MrCool's brand identity is built around self-installation, this specific step carries real safety and code-compliance stakes.