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MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker, MHK08U

SKU MHK08U
by MRCOOL
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Description

MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker (MHK08U)

Robust Emergency Heating. Universal Compatibility. Reliable Comfort for Larger Spaces.

Deliver powerful, immediate warmth to your customers with the MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker—engineered for seamless integration with the MRCOOL Universal Air Handler 36K BTU (MDUI18024036E). This UL-listed, high-capacity heat kit ensures your clients remain comfortable and protected during extreme cold snaps or unexpected heat pump downtime.

Why Install a Heat Kit?

Heat kits provide instant, direct electric heating—up to 30,000 BTU—right through the ductwork. Essential for emergency or backup use, they keep homes warm when the primary system can’t keep up. Designed for short-term or supplemental use, this heat kit is the reliable safeguard your customers expect from a professional installation.

Hassle-Free Professional Installation
  • Perfectly compatible with the MRCOOL Universal Air Handler 36K BTU—for seamless, efficient installs.
  • Integrated circuit breaker—adds safety, meets code requirements, and allows for easy servicing.
  • Compact, lightweight design—measuring just 12"W x 22"D x 7"H for convenient handling and installation.
  • UL Listed—for trusted safety and quality.
Key Features for Your Business
  • 8 KW (25,001 – 30,000 BTU) heating capacity—ideal for spaces up to 1,600 sq. ft.
  • Reliable emergency and supplemental heat—keeps clients comfortable during system downtime or extreme cold
  • Voltage: 208/230V/60Hz/40-45A (verify your installation meets these requirements)
  • Max Fuse Breaker: 45A
  • Min Circuit Ampacity: 40A
The Professional’s Choice for Confident Comfort

Don’t let your clients face winter’s worst unprepared. The MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker is your dependable solution for powerful, on-demand backup heat—delivering comfort, safety, and satisfaction with every Universal air handler installation.

Choose MRCOOL—where robust performance, safety, and customer peace of mind always come standard.

PRODUCT SPECIFICATIONS:

Product Dimensions 12"W x 22"D x 7"H
Equipment Type Heat Kit
Heating Capacity 25,001 - 30,000 BTU
Estimated Coverage Area 1,600 square feet
Voltage Requires a minimum of 208/230V/60HZ/40-45A (please check your home meets this electrical requirement prior to purchase)
Phase 1
Cycle 60
Max Fuse Breaker 45A
Min Circuit Ampacity 40A
Color Gray
Auxiliary Heater Sizes 8 KW
Certificate UL Listed
Contains Electronics Yes
Proposition 65 Warning Yes
Restricted States GU;PR;VI
Shipping and Return

We offer Free Express Shipping on all of our products. Handling times are 1-2 business days and Delivery takes roughly 3-14 Business days 

For more Shipping information visit here

We offer a 2 Year (730 Day) return for our products. 

For more Return information visit here

COVERAGE AREA

HIVE WARRANTY

HVAC Hive Warranty Information:

HVAC Hive is an authorized dealer for every product on our website. Every HVAC system and component comes with its original manufacturer's warranty, guaranteeing you receive a functional, quality product.

Our 5-Year Parts & Labor Warranty Promise: We go beyond the standard coverage. If a manufacturer's warranty doesn't cover your product for a full 5 years, HVAC Hive will extend both parts and labor warranty to complete the 5-year coverage period.

Example: If your manufacturer covers 2 years parts & labor, we'll cover an additional 3 years — giving you a full 5 years of parts and labor protection.

Warranty Coverage Includes:

  • Parts replacement for manufacturing defects
  • Labor costs for covered repairs
  • System malfunctions and component failures

Warranty Details:

  • Residential, light commercial, and full commercial warranties vary based on your usage
  • Specific warranty terms and coverage periods are listed on each product page
  • Both parts and labor are covered under our extended warranty program

Making a Warranty Claim: Contact our Worker Bee Support team at 1-888-712-2465 or karim@hvachive.com . We'll handle your claim quickly and professionally, covering both parts and labor costs. You can also contact the manufacturer directly if preferred.

Questions? Need help understanding your parts & labor warranty coverage? Our team is here to explain the details and ensure you're fully protected.

Contact US
Request an Installer

Product Overview

  • Zone / ROOM:

    Zone / ROOM:

  • Air Handler BTU:

    Air Handler BTU:

  • Condenser BTU:

    Condenser BTU:

  • Outdoor Operating Temp (Cool/ heat):

    Outdoor Operating Temp (Cool/ heat):

  • Warranty

    Warranty

Description

MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker (MHK08U)

Robust Emergency Heating. Universal Compatibility. Reliable Comfort for Larger Spaces.

Deliver powerful, immediate warmth to your customers with the MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker—engineered for seamless integration with the MRCOOL Universal Air Handler 36K BTU (MDUI18024036E). This UL-listed, high-capacity heat kit ensures your clients remain comfortable and protected during extreme cold snaps or unexpected heat pump downtime.

Why Install a Heat Kit?

Heat kits provide instant, direct electric heating—up to 30,000 BTU—right through the ductwork. Essential for emergency or backup use, they keep homes warm when the primary system can’t keep up. Designed for short-term or supplemental use, this heat kit is the reliable safeguard your customers expect from a professional installation.

Hassle-Free Professional Installation
  • Perfectly compatible with the MRCOOL Universal Air Handler 36K BTU—for seamless, efficient installs.
  • Integrated circuit breaker—adds safety, meets code requirements, and allows for easy servicing.
  • Compact, lightweight design—measuring just 12"W x 22"D x 7"H for convenient handling and installation.
  • UL Listed—for trusted safety and quality.
Key Features for Your Business
  • 8 KW (25,001 – 30,000 BTU) heating capacity—ideal for spaces up to 1,600 sq. ft.
  • Reliable emergency and supplemental heat—keeps clients comfortable during system downtime or extreme cold
  • Voltage: 208/230V/60Hz/40-45A (verify your installation meets these requirements)
  • Max Fuse Breaker: 45A
  • Min Circuit Ampacity: 40A
The Professional’s Choice for Confident Comfort

Don’t let your clients face winter’s worst unprepared. The MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker is your dependable solution for powerful, on-demand backup heat—delivering comfort, safety, and satisfaction with every Universal air handler installation.

Choose MRCOOL—where robust performance, safety, and customer peace of mind always come standard.

PRODUCT SPECIFICATIONS:

Product Dimensions 12"W x 22"D x 7"H
Equipment Type Heat Kit
Heating Capacity 25,001 - 30,000 BTU
Estimated Coverage Area 1,600 square feet
Voltage Requires a minimum of 208/230V/60HZ/40-45A (please check your home meets this electrical requirement prior to purchase)
Phase 1
Cycle 60
Max Fuse Breaker 45A
Min Circuit Ampacity 40A
Color Gray
Auxiliary Heater Sizes 8 KW
Certificate UL Listed
Contains Electronics Yes
Proposition 65 Warning Yes
Restricted States GU;PR;VI
Shipping and Return

We offer Free Express Shipping on all of our products. Handling times are 1-2 business days and Delivery takes roughly 3-14 Business days 

For more Shipping information visit here

We offer a 2 Year (730 Day) return for our products. 

For more Return information visit here

COVERAGE AREA

HIVE WARRANTY

HVAC Hive Warranty Information:

HVAC Hive is an authorized dealer for every product on our website. Every HVAC system and component comes with its original manufacturer's warranty, guaranteeing you receive a functional, quality product.

Our 5-Year Parts & Labor Warranty Promise: We go beyond the standard coverage. If a manufacturer's warranty doesn't cover your product for a full 5 years, HVAC Hive will extend both parts and labor warranty to complete the 5-year coverage period.

Example: If your manufacturer covers 2 years parts & labor, we'll cover an additional 3 years — giving you a full 5 years of parts and labor protection.

Warranty Coverage Includes:

  • Parts replacement for manufacturing defects
  • Labor costs for covered repairs
  • System malfunctions and component failures

Warranty Details:

  • Residential, light commercial, and full commercial warranties vary based on your usage
  • Specific warranty terms and coverage periods are listed on each product page
  • Both parts and labor are covered under our extended warranty program

Making a Warranty Claim: Contact our Worker Bee Support team at 1-888-712-2465 or karim@hvachive.com . We'll handle your claim quickly and professionally, covering both parts and labor costs. You can also contact the manufacturer directly if preferred.

Questions? Need help understanding your parts & labor warranty coverage? Our team is here to explain the details and ensure you're fully protected.

Contact US

Commercial HVAC PROS!

Unlock Installer Benefits Now:

  • ✓ Exclusive BULK Pricing
  • ✓ Limited Time Deals
  • ✓ Unmatched Service & Support
  • ✓ Technical support
  • ✓ Extended Warranty & Maintenance
"Their technical expertise in commercial HVAC systems is outstanding. From equipment selection to installation support, they provided everything we needed. The bulk pricing saved us thousands on our multi-building project, and their 24/7 technical support kept us running smoothly."
- Marcus R., HVAC Project Manager, 06/24

You'll hear from us during business hours

Request an Installer

Need Professional Installation?

Get Connected with Certified HVAC Installers:

  • ✓ Pre-Vetted, Licensed & Insured Installers
  • ✓ 2-3 Local Options in Your Area
  • ✓ Specialists in Your Equipment Type
  • ✓ Competitive, Transparent Pricing
  • ✓ Fast Response - Within 24 Hours

How it works:

1. Fill out the form below with your project details
2. We'll match you with 2-3 qualified installers in your area
3. Installers contact you directly with quotes and availability
4. You choose the best fit for your project

"I bought a heat pump online but wasn't sure about installation. HVAC Hive connected me with three local contractors within hours. I chose one based on reviews and pricing - he installed it perfectly the next week. Made the whole process so much easier!"
- Jennifer M., Homeowner, Phoenix AZ

✓ No obligation quotes | ✓ All installers background checked | ✓ Free service - you only pay the installer

We'll connect you with installers within 48 hours during business days

Frequently Asked Questions about MRCOOL 8 KW Universal Air Handler Heat Strip with Circuit Breaker, MHK08U

Most Frequently Asked Questions

For an 8 kW heat strip on 240V, you typically need a 40-amp double-pole breaker (since 8,000 watts ÷ 240 volts = 33.3 amps; code requires rounding up to the next standard size and accounting for continuous load). Always confirm with the product manual and a licensed electrician for your specific installation and local code requirements.
The breaker size for a heat pump air handler depends on the specific model and whether it includes electric heat strips, but most residential air handlers require a 15- to 60-amp double-pole breaker; always consult the unit’s nameplate, installation manual, and a licensed electrician to determine the correct breaker size for your setup and local codes.
Some air handlers include a factory-installed circuit breaker, but many do not; typically, a properly sized external circuit breaker in your electrical panel is required to protect the air handler and comply with electrical codes. Always consult your specific air handler’s documentation for details.

Other Questions

Your air handler has two breakers because one breaker powers the air handler’s blower and controls, while the other supplies power to an electric heat strip or auxiliary heating element—each requiring separate circuits for proper operation and safety.
The breaker size for a mini split heat pump depends on the specific unit’s electrical requirements, but most residential mini splits require a 15- to 30-amp double-pole breaker; always consult the unit’s nameplate, installation manual, and a licensed electrician to determine the correct breaker size for your model and local codes.

Reviews

Express Free Shipping

Process orders within 1-2 days

Stress Free Returns

Get Covered for (730 days) Returns

Premum Quality

Top Tier Products, Even Better Customer Care

5 Year Warranty

We Believe In Our Products & Our Team