SKU: 14219948681

MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Air Handler 230V, DIY-18-HP-WMAH-230D25-O

Sale price$423.00 Regular price$470.00
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Description

MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Air Handler 230V, DIY-18-HP-WMAH-230D25-OMRCOOL DIY 5th Gen 18,000 BTU Multi Zone Mini Split Air Handler 230V Model: DIY 18 HP WMAH 230D25 O Ideal Coverage: Up to 750 sq. ft. Power: 230V Refrigerant: R 454B The MRCOOL DIY 5th Generation 18K BTU Multi Zone Wall Mount Air Handler offers year round comfort for larger areas such as great rooms, bonus rooms, garages, and more. Engineered to pair with MRCOOL DIY multi zone condensers, this indoor unit ensures efficient heating and cooling, modern

MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Air Handler – 230V

Model: DIY-18-HP-WMAH-230D25-O

Ideal Coverage: Up to 750 sq. ft. • Power: 230V • Refrigerant: R-454B

The MRCOOL® DIY 5th Generation 18K BTU Multi-Zone Wall Mount Air Handler offers year-round comfort for larger areas such as great rooms, bonus rooms, garages, and more. Engineered to pair with MRCOOL® DIY® multi-zone condensers, this indoor unit ensures efficient heating and cooling, modern controls, and simple DIY installation.

🔥 Key Features

  • DIY Installation: No vacuuming or special tools needed. Perfect for homeowners and pros alike.
  • QuickConnect® Line Set: Pre-charged with R-454B refrigerant for fast, mess-free hookup
  • Green Refrigerant: Lower Global Warming Potential (GWP) than R-410A for reduced environmental impact
  • DIYPRO® Cable: Outdoor-rated armored cable for superior durability without electrical conduit
  • Smart Wireless Control: Includes remote and integrates with the SmartHVAC App, Amazon Alexa, and Google Assistant
  • Follow Me Technology: Maintains your target temperature based on where the remote is located
  • Dry Mode: Reduces humidity and improves indoor air quality

📏 Room Size Coverage

This unit is ideal for larger rooms up to 750 sq. ft., including open-concept living areas or oversized bedrooms.

🛡️ Industry-Leading Warranty

  • Compressor: 7-Year Warranty
  • Parts: 5-Year Warranty
  • Lifetime Replacement: Available through MRCOOL® Care Program Enrollment

⚠️ Compatibility Notice

This air handler is pre-charged with R-454B refrigerant and is not compatible with older R-410A systems. Always pair with MRCOOL® 5th Gen R-454B multi-zone condensers and components for proper function.

Buy from MRCOOL DIY Direct – America’s most trusted source for DIY HVAC systems and parts.

Specifications & Dimensions

Specification Details
Model Number DIY-18-HP-WMAH-230D25-O
Cooling Capacity 18,000 BTU/h
Heating Capacity 18,000 BTU/h
Recommended Coverage Area Up to 750 sq. ft.
Power Supply 208–230V, 60Hz, 1 Phase
Minimum Circuit Ampacity 5 A (est.)
Maximum Fuse 15 A (est.)
Refrigerant Type R-454B
Line Set Size 1/4" Liquid x 1/2" Gas
Communication Cable Included Yes, 4-conductor
Wireless Control Remote, SmartHVAC App, Alexa, Google Assistant
Remote Sensor (Follow Me) Yes
Dry Mode Function Yes
Mounting Type Wall-Mounted
Dimensions (WxDxH) Approx. 39" x 8.5" x 12.5"
Net Weight Approx. 26 – 30 lbs
ETL Listing Number 5031495
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 14219948681

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4.6 ★★★★★
Based on 24 reviews
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Verified Purchase
Kevin Finn
Louisville, US
★★★★★ 5
Great mug warmer with temp control
Color: Black
I replaced a cheap mug warmer with a couple of these for the house, and for almost the same price this is a lot more functional. I really like the temperature control and silicone surface protector. In combination with the carafe below, this has changed my life - no more microwaving coffee all morning. https://www.amazon.com/GiNT-Stainless-Thermal-Thermos-Retention/dp/B07MW5N7MS
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Reviewed in the United States on May 10, 2026
E
Verified Purchase
Esmeralda
Phoenix, US
★★★★★ 5
Super Satisfied Customer Here!
Color: Gold, Color: Gold
I purchased the gold/black mug warmer. I always spend a good about of money for great coffee products and I take my time to perfect my coffee for my mornings at work. However, I get pulled into urgent meetings and just something urgent and I always leave more than half of my coffee behind. When I come back it’s cold and that’s very disappointing considering the money and time I spent to make it bc I then have to toss it. I don’t believe in microwaves and I refuse to use one. When I found this, I was super excited! It looks perfect at my desk and it works perfect! I would have liked it to be more on the brass gold like my pen holder, but it’s just as pretty! As you can see, my mug had a layer on the bottom and that made me think it may not work well, but it did the job. My coffee was super warm and it got even hotter as I left it there tearing it. I turned it one before making my coffee, so I’m not sure exactly how long it took to warm up but for me, by the time I got back, it was the peg temperature. I highly recommend this to anyone who has the same struggles. No more cold coffees! Thank you!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 21, 2026
T
Verified Purchase
Timothy Mousseau
Lake Worth, US
★★★★★ 5
Neat gadget
Color: Gold
Neat little gadget. Works great, easy to use and has a light indicator for temperature range. Keeps a cup of liquid hot right to the bottom.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
C
Verified Purchase
Ctg1363
Pawtucket, US
★★★★★ 5
My tea stays warm to the bottom of the cup!!!
I am so glad I purchased this mug water. I drink tea all day but it cools down quickly. Since I purchased this mug warmer my tea stays hot to the bottom of the cup. The temperature is adjustable so you can keep your drink at your desired temperature. The top is glass and wipes clean easily. I like the rubber gasket that fits on top of the warmer. It keeps your mug in the center of the warmer and should you have a spill it catches the liquid. I've been using it every day for over a month now and it's going strong and is reliable. Perfect for personal use or as a gift.
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Reviewed in the United States on May 2, 2026
S
Verified Purchase
Sarah Akin
Omaha, US
★★★★★ 5
Keeps my coffee as hot as I want it to be
Color: Silver
This coffee warmer is much better than the candle warmer that I was using for my coffee before. With a range of 3 temperatures, I have a choice of temperatures from hot to very, very hot, and the warmer shuts itself off after a while, just in case I forget. The description advises that ceramic cups do not retain heat as well as flat-bottomed cups, but I have not found that to be a problem. Coffee in my ceramic mug stays as hot as I want it to be. The knob on the side makes this warmer easy to turn on and to select a temperature, plus I feel that it is a good value.
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Reviewed in the United States on February 11, 2026

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