Pioneer® Diamante Pro™ 18,000 BTU 21 SEER2 Ductless Mini Split Inverter Heat Pump System – 230V High-Wall AC with 16 Ft Installation Kit

Upgrade your home or business comfort with the Pioneer® Diamante Pro™ 18,000 BTU 21 SEER2 Ductless Mini Split Air Conditioner & Heat Pump System—a premium, energy-efficient climate control solution designed for powerful performance and year-round comfort.

Perfect for medium to large rooms, this high-efficiency mini split system delivers rapid cooling and heating while helping you save on energy bills thanks to advanced inverter technology and an impressive 21 SEER2 rating.

Whether you're looking to buy a ductless air conditioner online, upgrade your HVAC system, or install a quiet, energy-saving cooling solution, the Diamante Pro™ series is engineered for reliability, performance, and convenience.

Summary at a Glance

• High Efficiency Diamante Pro™ Ductless Mini Split Heat Pump System
• Cooling capacity: 18,000 BTU/H with 21 SEER2 / 10.5 EER2 efficiency
• Heating capacity: 18,000 BTU/H with 9.5 HSPF2 / 3.41 COP2 efficiency
• Voltage: 208/230V, 60Hz, 1Ph
• High Wall-Mounted Ductless Air Conditioning & Heating System
• Variable-Speed DC Inverter Driven Performance
• Factory-Precharged with Environmentally Friendly R454b Refrigerant
• Low Ambient Range Operation (As low as -4°F in Heating / As high as 122°F in Cooling)

Key Features

Powerful Cooling & Heating Performance

• 18,000 BTU capacity ideal for rooms up to ~700–1,000 sq. ft.
• Efficient cooling during hot summers and reliable heating in colder months
• Perfect for homes, apartments, offices, and commercial spaces

Ultra High Energy Efficiency – 21 SEER2

• Save more with low energy consumption mini split system
• Advanced inverter compressor reduces power usage and operating costs
• Environmentally friendly and cost-effective HVAC solution

Whisper-Quiet Operation

• Enjoy ultra-quiet indoor performance
• Ideal for bedrooms, living rooms, and workspaces

Inverter Heat Pump Technology

• Delivers precise temperature control
• Faster cooling/heating with less energy waste
• Maintains consistent comfort year-round

Complete Installation Kit Included

• Comes with 16 Ft line set and accessories
• Simplifies installation and reduces additional costs
• Perfect for professional or DIY installation

Smart Comfort Control

• Remote control included for easy operation
• Adjustable modes: cooling, heating, dehumidification, fan-only, auto

Why Choose the Pioneer Diamante Pro™ Mini Split?

• Best-selling ductless mini split air conditioner with heat pump
• Ideal for energy-efficient home cooling systems
• Trusted brand known for durability and performance
• Perfect for those searching for quiet mini split AC units for sale
• Excellent value for high SEER mini split systems
• Heat Pump with Cooling, Heating, Dry, and Ventilation Modes
• Dual-Drainage Ports
• Washable, Reusable Air Filters
• Dual-Axis Airflow (Motorized Up-Down and Left-Right Louvers)
• Functional Remote with:
  • ECO and SLEEP Modes, for Energy-Conservation
  • Timer On/Off Control
  • TURBO, for Times of High-Demand
  • Self-Clean Cycle
  • MEMORY, to Recall Favorite Settings
  • IFEEL, to Detect and Adjust to Local Temperature

Ideal For

• Bedrooms, living rooms, and large open spaces
• Apartments, condos, and home additions
• Offices, shops, and light commercial use
• Anyone looking to buy an energy-efficient mini split AC system online

Technical Information & Performance

• AHRI Certificate
• Energy Guide
• Submittal Sheet

• System Kit

  • Power Supply: 208~230V, 60Hz, 1Ph
  • Cooling Rated Capacity: 18,000 BTU/h (1.5 Ton)
  • Cooling Capacity Range: 4,090~18,400 BTU/h
  • Cooling SEER2: 21.0 BTU/W.h
  • Cooling EER2: 10.5 BTU/W.h
  • Heating Rated Capacity: 18,000 BTU/h (1.5 Ton)
  • Heating Capacity Range: 4,090~19,000 BTU/h
  • Heating HSPF2 (Region IV/V): 9.5 / 8.2 BTU/W.h
  • Heating C.O.P.2 (47°F/5°F): 3.41 / 1.8 W/W
  • Refrigerant Type: R454b
  • Recommended Room Size: 500~750 sq ft
  • Minimum Room Size: 40 sq ft
  • Piping Diameter: 3/8" (Gas) / 1/4" (Liquid)
  • AHRI Reference: 217048744

• Indoor Unit

  • Part Number: WT018GLSI20HLF
  • Air Flow (Turbo/Hi/Med/Lo/Mute): 617 / 575 / 511 / 411 / 382 CFM
  • Sound Level (Turbo/Hi/Med/Lo/Mute): 49 / 47 / 42 / 37 / 32 dB(A)
  • Product Dimensions (WDH): 39"-3/4 x 9" x 12"-3/8 Inches
  • Carton Dimensions (WDH): 43"-1/8 x 11"-3/4 x 15"-3/8 Inches
  • Net / Gross Weight: 27.6 / 33.7 lbs

• Outdoor Unit

  • Part Number: YN018GLSI20RPF
  • Breaker Needed: 20A (double-pole)
  • Sound Level: 55 dB(A)
  • Net Dimensions (WDH): 34" x 13"-3/4 x 23"-3/4 Inches
  • Carton Dimensions (WDH): 35"-1/2 x 16" x 27" Inches
  • Net / Gross Weight: 70.5 / 82.7 lbs

Experience superior comfort and efficiency today.

Order your Pioneer® Diamante Pro™ 18,000 BTU Mini Split now and enjoy fast, reliable climate control with lower energy costs!

Dimension Chart