MRCOOL Universal® R-454B Electric Heat Kits (5kW–20kW) for Universal Series Air Handlers
The MRCOOL Universal® R-454B Electric Heat Kits are designed to provide dependable auxiliary and emergency backup heat for MRCOOL Universal Series air handlers. Installed directly into the air handler cabinet, these heat kits automatically supplement or replace heat pump operation when outdoor temperatures drop, during defrost cycles, or whenever additional heating capacity is required. This ensures uninterrupted indoor comfort even in colder climates or extreme winter conditions.
Available in capacities ranging from 5kW to 20kW, these heat kits allow precise system matching based on air handler size, home square footage, and regional heating demands. Each model includes an integrated circuit breaker for added protection and simplified electrical installation. Designed specifically for Universal Series R-454B systems, these heat kits integrate seamlessly with system controls and thermostats, activating only when needed to maintain efficiency while delivering reliable warmth.
Built for durability and safety, MRCOOL Universal heat kits operate on 208/230V single-phase power and are engineered for long-term performance. Their compact design allows for clean, space-efficient installation inside the air handler, making them an essential upgrade for homeowners seeking added peace of mind and consistent heating performance throughout the coldest months of the year.
Key Features
-
Provides auxiliary and emergency electric heat
-
Designed for MRCOOL Universal® Series R-454B air handlers
-
Integrated circuit breaker for safety and protection
-
Automatic operation through system controls and thermostat
-
Multiple capacity options for precise system matching
-
Compact, air-handler-mounted design
-
Ideal for cold climates and extreme winter operation
Available Models & Compatibility
-
5kW Heat Kit – Model: UHK05
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O -
8kW Heat Kit – Model: UHK08
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O, UAH18048-O -
10kW Heat Kit – Model: UHK10
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O, UAH18048-O, UAH18060-O -
15kW Heat Kit – Model: UHK15
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O, UAH18048-O, UAH18060-O -
20kW Heat Kit – Model: UHK20
Compatible air handlers: UAH18036-O, UAH18048-O, UAH18060-O
Specifications (Common Across Models)
-
Brand: MRCOOL
-
Series: Universal® R-454B
-
Unit Type: Universal Series Heat Kit
-
Voltage: 208/230V
-
Phase: Single Phase
-
Frequency: 60 Hz
-
Installation Location: Inside air handler
-
Application: Auxiliary / Emergency electric heat
Free Shipping
Free standard shipping on all orders within the continental United States.
Order Confirmation & Tracking
After placing your order, you will receive an order confirmation email. Once your order ships, a shipping confirmation email with tracking details will be sent to the email address provided at checkout. If your order ships in multiple packages, you may receive more than one tracking number.
If you have not received tracking information within three business days, please contact us at info@thelivingoutlet.com.
Order Processing Time
Orders are typically processed within 2–3 business days. In the event of unexpected inventory delays, we will notify you before shipment.
Delivery Timeframes
Carrier transit times generally range from 5–7 business days after shipment. Delivery times may vary due to location, weather, carrier schedules, or peak shipping periods.
Returns
You may request a return within 30 days of delivery, provided the item is unused, uninstalled, and returned in original packaging.
- • A 25% restocking fee applies to eligible returns
- • Return shipping costs are the customer’s responsibility
- • A Return Merchandise Authorization (RMA) is required before returning any item
For complete details, please review our Return & Refund Policy.
Order Cancellation
If you need to cancel or change an order, please contact us immediately before the order ships.
Once an order has shipped, it can no longer be canceled and will follow our standard return process.
Please note: Custom or special-order items cannot be canceled once processing has begun.
As an authorized dealer, we assist customers with warranty questions, product registration, and coordination with the manufacturer when needed.
You can review complete warranty details below.
Click here to view the warranty policy in detail
If you have any questions about warranty, or need assistance with your product registration please contact us at info@thelivingoutlet.com
Price Match
We are committed to providing the best prices online. If you find a lower price on another site, let us know, and we’ll match it. We want you to be confident that you’re getting the best deal possible on the product you’re ordering.
CLICK HERE TO VIEW OUR PRICE MATCH POLICY
Have Questions?
If you have questions, please reach out:
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Credit & Debit Cards
- Visa
- MasterCard
- American Express
- Discover
- Diners Club
Digital Wallets & Online Payments
- Shop Pay
- Apple Pay
- PayPal
- Google Pay
For more details, please visit our Payment Policy page.
Installment Options
You can also pay in installments using the following service:
- Shop Pay Installments
For more information, please visit our Financing page.
Need Help?
If you need assistance with payment options, reach out to us;
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Description
MRCOOL Universal® R-454B Electric Heat Kits (5kW–20kW) for Universal Series Air Handlers
The MRCOOL Universal® R-454B Electric Heat Kits are designed to provide dependable auxiliary and emergency backup heat for MRCOOL Universal Series air handlers. Installed directly into the air handler cabinet, these heat kits automatically supplement or replace heat pump operation when outdoor temperatures drop, during defrost cycles, or whenever additional heating capacity is required. This ensures uninterrupted indoor comfort even in colder climates or extreme winter conditions.
Available in capacities ranging from 5kW to 20kW, these heat kits allow precise system matching based on air handler size, home square footage, and regional heating demands. Each model includes an integrated circuit breaker for added protection and simplified electrical installation. Designed specifically for Universal Series R-454B systems, these heat kits integrate seamlessly with system controls and thermostats, activating only when needed to maintain efficiency while delivering reliable warmth.
Built for durability and safety, MRCOOL Universal heat kits operate on 208/230V single-phase power and are engineered for long-term performance. Their compact design allows for clean, space-efficient installation inside the air handler, making them an essential upgrade for homeowners seeking added peace of mind and consistent heating performance throughout the coldest months of the year.
Key Features
-
Provides auxiliary and emergency electric heat
-
Designed for MRCOOL Universal® Series R-454B air handlers
-
Integrated circuit breaker for safety and protection
-
Automatic operation through system controls and thermostat
-
Multiple capacity options for precise system matching
-
Compact, air-handler-mounted design
-
Ideal for cold climates and extreme winter operation
Available Models & Compatibility
-
5kW Heat Kit – Model: UHK05
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O -
8kW Heat Kit – Model: UHK08
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O, UAH18048-O -
10kW Heat Kit – Model: UHK10
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O, UAH18048-O, UAH18060-O -
15kW Heat Kit – Model: UHK15
Compatible air handlers: UAH18024-O, UAH18030-O, UAH18036-O, UAH18048-O, UAH18060-O -
20kW Heat Kit – Model: UHK20
Compatible air handlers: UAH18036-O, UAH18048-O, UAH18060-O
Specifications (Common Across Models)
-
Brand: MRCOOL
-
Series: Universal® R-454B
-
Unit Type: Universal Series Heat Kit
-
Voltage: 208/230V
-
Phase: Single Phase
-
Frequency: 60 Hz
-
Installation Location: Inside air handler
-
Application: Auxiliary / Emergency electric heat
Shipping & Returns
Free Shipping
Free standard shipping on all orders within the continental United States.
Order Confirmation & Tracking
After placing your order, you will receive an order confirmation email. Once your order ships, a shipping confirmation email with tracking details will be sent to the email address provided at checkout. If your order ships in multiple packages, you may receive more than one tracking number.
If you have not received tracking information within three business days, please contact us at info@thelivingoutlet.com.
Order Processing Time
Orders are typically processed within 2–3 business days. In the event of unexpected inventory delays, we will notify you before shipment.
Delivery Timeframes
Carrier transit times generally range from 5–7 business days after shipment. Delivery times may vary due to location, weather, carrier schedules, or peak shipping periods.
Returns
You may request a return within 30 days of delivery, provided the item is unused, uninstalled, and returned in original packaging.
- • A 25% restocking fee applies to eligible returns
- • Return shipping costs are the customer’s responsibility
- • A Return Merchandise Authorization (RMA) is required before returning any item
For complete details, please review our Return & Refund Policy.
Order Cancellation
If you need to cancel or change an order, please contact us immediately before the order ships.
Once an order has shipped, it can no longer be canceled and will follow our standard return process.
Please note: Custom or special-order items cannot be canceled once processing has begun.
Warranty
As an authorized dealer, we assist customers with warranty questions, product registration, and coordination with the manufacturer when needed.
You can review complete warranty details below.
Click here to view the warranty policy in detail
If you have any questions about warranty, or need assistance with your product registration please contact us at info@thelivingoutlet.com
Price Match Policy
Price Match
We are committed to providing the best prices online. If you find a lower price on another site, let us know, and we’ll match it. We want you to be confident that you’re getting the best deal possible on the product you’re ordering.
CLICK HERE TO VIEW OUR PRICE MATCH POLICY
Have Questions?
If you have questions, please reach out:
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Payment Options
Credit & Debit Cards
- Visa
- MasterCard
- American Express
- Discover
- Diners Club
Digital Wallets & Online Payments
- Shop Pay
- Apple Pay
- PayPal
- Google Pay
For more details, please visit our Payment Policy page.
Installment Options
You can also pay in installments using the following service:
- Shop Pay Installments
For more information, please visit our Financing page.
Need Help?
If you need assistance with payment options, reach out to us;
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Frequently Asked Questions
The 5th Generation MRCOOL DIY® Mini Split introduces several major advancements over the 4th Gen, designed for higher efficiency, smarter operation, and environmental responsibility.
Key improvements include:
• Eco-Friendly R-454B Refrigerant:
Uses a next-generation refrigerant with significantly lower global warming potential (GWP), meeting the latest environmental standards.
• Greater Energy Efficiency:
Upgraded SEER2 ratings deliver improved performance and reduced energy consumption.
• Enhanced Reliability:
Stronger internal components improve long-term durability and heating/cooling consistency.
Yes. MRCOOL DIY systems are specifically engineered for homeowner installation — no special HVAC tools or refrigerant handling required. The pre-charged Quick Connect® lines make connecting the indoor and outdoor units simple.
⚠️ Note: A licensed electrician must complete the final electrical connection to ensure safety and compliance with local codes.
Absolutely. Every MRCOOL 5th Gen model functions as a heat pump, providing efficient heating in winter and cooling in summer for year-round comfort.
Yes. The 5th Gen systems include low-ambient heating technology, allowing reliable performance even when outdoor temperatures drop to around -13°F.
A general guideline is about 20 BTU per square foot of conditioned area.
.
Use this quick reference chart:
.
6,000 BTU = 100 - 150 sq ft
9,000 BTU = 150 - 350 sq ft
12,000 BTU = 351- 500 sq ft
18,000 BTU = 501 – 750 sq ft
24,000 BTU = 751 – 1,000 sq ft
36,000 BTU = 1,001 - 1,500 sq ft
Keep in mind factors like insulation, ceiling height, sunlight exposure, and appliance heat output may affect the sizing. For personalized help, contact our Product Experts.
Yes. All 5th Gen MRCOOL DIY systems feature built-in SmartHVAC Wi-Fi control, compatible with both Amazon Alexa and Google Assistant. You can adjust temperature, modes, and schedules directly from your smartphone.
MRCOOL 5th Gen DIY Mini-Splits include industry-leading warranty protection:
7-Year Compressor Replacement Warranty: If the compressor fails within seven years, MRCOOL provides a replacement.
5-Year Parts Warranty: Covers all other system components for five years from the purchase date.
