MRCOOL® 18K 3-Zone DIY® Mini Split System With Three 6K Indoor Units and three 25ft pre- charged line sets - R-454B - DIYM318HPW00D15

Product Description 

Model: DIYM318HPW00D15

The MRCOOL® DIYM318HPW00D15 is the ultimate multi-room comfort solution for homeowners who want professional-grade heating and cooling without hiring an HVAC contractor. Designed around MRCOOL’s industry-leading DIY® platform, this 3-zone system delivers precise comfort control to three separate rooms, all from one compact outdoor condenser.

This bundle pairs an 18,000 BTU DIY® multi-zone condenser with three 6K wall-mounted air handlers, each connected using 25-foot pre-charged DIY® QuickConnect® line sets. That added line length gives you more flexibility for installs where indoor units are farther from the condenser — without sacrificing efficiency, performance, or warranty protection.

Powered by R-454B refrigerant, protected with Gold Fin® corrosion-resistant coating, and controlled through the MRCOOL® Smart HVAC Controller®, this system is built for long-term reliability, energy efficiency, and simple DIY installation.

18K MRCOOL® DIY® MULTI-ZONE CONDENSER (DIY-MULTI3-18HP230D-O)

At the heart of this system is the MRCOOL® DIY® 18K 3-zone condenser, engineered to deliver steady, inverter-driven comfort across multiple rooms.

Key Performance Highlights

• Supports up to 3 independent zones
• High efficiency SEER2-rated performance
• DC inverter compressor for quiet, variable output
• Factory-sealed DIY® QuickConnect® ports — no vacuuming, gauges, or refrigerant handling
• Gold Fin® coated outdoor coil for coastal and high-humidity durability
• ENERGY STAR® & AHRI Certified

Electrical Requirements

• Minimum Circuit Ampacity: 15A
• Maximum Fuse / Breaker: 20A

️ THREE 6K DIY® WALL-MOUNT AIR HANDLERS (DIY-06-HP-WMAH-230D25-O)

This bundle includes three 6,000 BTU indoor air handlers, ideal for bedrooms, offices, nurseries, studios, bonus rooms, or guest spaces up to ~150- 200 sq. ft. Each. 

Each air handler features:

• Whisper-quiet operation
• Follow Me® technology — senses temperature at the remote, not the ceiling
• Dry Mode for humidity control
• Washable air filter
• Multiple fan speeds + auto mode
• Full control via remote, app, or voice assistant

Every zone operates independently, allowing different temperatures in each room for maximum comfort and efficiency.

THREE 25-FT DIY® QUICKCONNECT® LINE SETS (DIY25-1438-O)

Unlike standard kits, this bundle upgrades you to three 25-foot pre-charged line sets, perfect for longer or more complex installations.

Line Set Details

• 25 ft length (extended reach)
• Factory-sealed R-454B refrigerant
• DIY® QuickConnect® fittings
• Integrated DIYPRO® cable (communication wire inside insulation)
• No brazing, no refrigerant tools, no HVAC license required

This is one of the easiest multi-zone installs on the market.

WHAT’S INCLUDED — DIYM318HPW00D15

Outdoor Unit

• (1) MRCOOL® DIY® 18K 3-Zone Condenser
  Model: DIY-MULTI3-18HP230D-O

Indoor Units

• (3) MRCOOL® 6K Wall-Mounted Air Handlers
  Model: DIY-06-HP-WMAH-230D25-O

Line Sets

• (3) MRCOOL® 25 ft DIY® QuickConnect® Line Sets w/ DIYPRO® Cable
  Model: DIY25-1438-O

Accessories

• Wireless remotes
• Wall mounting hardware
• MRCOOL® Smart HVAC Controller® module
• Installation manuals

Smartphone not included.

❓ FAQ — Frequently Asked Questions 

Can each room be set to a different temperature?

Yes. Each zone operates independently through the MRCOOL® Smart HVAC Controller®.

Is this system truly DIY?

Yes. The DIY® QuickConnect® system eliminates vacuuming, brazing, and refrigerant handling.

Why does this bundle include 25-ft line sets?

For longer installation runs or condenser placement flexibility beyond standard 16-ft kits.

Is this system efficient?

Extremely. Inverter technology + R-454B refrigerant = lower energy bills year-round.

Does it support Alexa or Google Assistant?

Yes. Full voice control supported.

Why Buy From MRCOOL DIRECT?

When you order from MRCOOL Direct, you get:

• ✅ Authorized MRCOOL dealer – Your warranty is protected
• ✅ Factory-fresh units – No refurbished or mystery sources
• ✅ Fast U.S. shipping – Most in-stock items ship in 1–3 business days
• ✅ Financing options – Make high-efficiency comfort more affordable
• ✅ Real product support – Help with sizing, line set selection, and DIY questions
• ✅ No third-party marketplace middlemen – Just genuine MRCOOL systems from a trusted dealer

BUY DIRECT!

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615-553-8118

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