MRCOOL DIY 5th Gen E Star 18,000 BTU Multi Zone Mini Split Air Handler 230V (DIY-18-HP-WMAH-230D25-O)
The 5th Generation MRCOOL® DIY® 18K BTU Ductless Heat Pump Single Zone Mini-Split Air Handler is a powerful and efficient solution for heating and cooling spaces up to 800 sq. ft.
Designed with a true DIY installation in mind, this system eliminates the need for special tools or professional assistance, making setup fast, simple, and cost-effective. One of the standout features is the pre-charged 25-foot DIY® QuickConnect® line set, which comes pre-filled with R-454B refrigerant. This means there’s no need for vacuuming, cutting down on installation time and costs. Additionally, the included DIYPRO® cable removes the need for electrical conduit, providing added durability and protection against outdoor elements and wildlife. Controlling your system is effortless with multiple options to fit your lifestyle. Adjust settings using the wireless remote, the SmartHVAC app for Apple and Android devices, or hands-free voice commands through Amazon Alexa and Google Assistant.
Engineered for long-lasting performance, the Gold Fin® Condenser in the outdoor unit offers superior corrosion resistance, especially beneficial in coastal environments. For added comfort, the Follow Me function on the remote allows the air handler to monitor and adjust airflow based on the remote’s location, ensuring even temperature control. Dry Mode helps maintain a comfortable indoor environment by reducing excess humidity and condensation buildup. Backed by industry-leading warranties—including a limited lifetime warranty, a 7-year compressor warranty, and a 5-year parts warranty—the 5th Generation MRCOOL® DIY® is built for reliability. Enjoy smart features, easy installation, and dependable year-round comfort with this innovative ductless mini-split system.
Features
- Intertek listed 5031495
- Easy DIY installation
- Future-proof your investment with the included DIYPro® cable, eliminating the need for electrical conduit.
- Keep the included remote close by, and MRCOOL DIY®'s Follow Me® function will track the air temperature around you to ensure maximum comfort.
- The MRCOOL® Smart HVAC Controller® Module and App fully support Google Assistant & Amazon Alexa out of the box.
Specifications
Dimensions |
8.9" D x 13.19" H x 42.52" W |
Tonnage |
1.5 |
Voltage (V) |
208/230 |
Phase |
1 |
Cycle |
60 |
Max Fuse Breaker (A) |
15 |
Min Circuit Ampacity (A) |
3 |
Mount Type |
Wall |
Color |
White |
Max Coverage Area |
800 sqft |
Decibel Rating Low (DBA) |
19 |
Decibel Rating High (DBA) |
54.5 |
Number of Speeds |
5 |
Oscillation |
Yes |
Liquid Line Size |
1/4 |
Suction Line Size |
1/2 |
Filter Type |
Reusable |
Auxiliary Heater Included |
No |
Auxiliary Heater Available |
No |
Fan Only Option |
Yes |
Quiet Mode |
Yes |
Auto Cool |
Yes |
WIFI Compatibility |
Yes |
APP Compatibility |
Yes |
Works with IOS |
Yes |
Remote Control Included |
Yes |
UL Listed |
Yes |
ETL Listed |
Yes |
| Energy Star Certified |
|
AHRI Certified |
Yes |
Registered Warranty |
Extended Limited Lifetime* |
Base Parts Warranty |
5 |
Base Compressor Warranty |
7 |
Has Batteries |
Yes |
Contains Electronics |
Yes |
Contains Chemicals |
Yes |
Contains Aerosol |
Yes |
Contains Compressed Gas |
Yes |
Proposition 65 Warning |
Yes |
Net Weight (Lbs) |
35.49 |
Gross Depth (In) |
17.68 |
Gross Height (In) |
14.29 |
Gross Width (In) |
46.73 |
Gross Weight (Lbs) |
49.6 |
What our Experts Think
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Efficient Cooling & Heating – 18,000 BTU capacity ideal for single-zone spaces.
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DIY-Friendly Design – 5th Generation E-Star system allows easy installation without professional help.
-
Energy Savings – Advanced inverter technology reduces electricity costs.
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Flexible Placement – Multi-zone capability adapts to different room layouts.
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Reliable Performance – Built for quiet, consistent operation year-round.
Q&A
Q: What is the cooling capacity of this air handler?
A: The MRCOOL DIY-18-HP-WMAH-230D25-O provides 18,000 BTU, ideal for medium-sized rooms or multi-zone setups.
Q: Is this unit compatible with multi-zone mini split systems?
A: Yes, it’s designed for 5th Gen DIY multi-zone systems, allowing flexible zoning for different areas.
Q: What voltage does it use?
A: This air handler operates on 230V, suitable for residential and light commercial applications.
Q: Does it support DIY installation?
A: Yes, it comes ready for easy DIY setup with MRCOOL pre-charged line sets, reducing the need for professional installation.
Q: Can it provide both heating and cooling?
A: Yes, it functions as a heat pump air handler, delivering year-round comfort in all zones.
Q: Who is this air handler ideal for?
A: Perfect for homeowners and contractors seeking a flexible, energy-efficient, and easy-to-install multi-zone solution.
Maintenance Tips
-
Clean or replace air filters every 4–6 weeks for optimal airflow.
-
Wipe down indoor coils and vents to prevent dust buildup.
-
Ensure condensate drain is clear to avoid water leaks.
-
Inspect refrigerant lines and electrical connections periodically.
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Keep surrounding area unobstructed for proper ventilation.
