Mitsubishi MSZ-WX18NL & MUZ-WX18NL 18,000 BTU 18 SEER2 Wall Mounted Heat Pump System - R454B

Mitsubishi MSZ‑WX18NL & MUZ‑WX18NL: 18,000 BTU Wall‑Mounted Heat Pump System

The Mitsubishi MSZ‑WX18NL indoor unit, paired with the MUZ‑WX18NL outdoor condenser, delivers efficient 18,000 BTU heating and cooling in a sleek, single-zone ductless mini-split ideal for rooms up to 750 sq ft. Featuring INVERTER-driven precision and eco-friendly R‑454B refrigerant, this system ensures reliable year-round comfort with whisper-quiet operation and advanced air filtration.

Equipped with nano-platinum and enzyme filters, Blue Fin anti-corrosion coating, and Wi-Fi-ready smart controls, the slim wall-mounted indoor unit fits unobtrusively on walls, while the compact MUZ condenser provides dependable heating performance down to -14°F outdoor temperatures.

General Information
System Type: Wall-mounted ductless air handler + single-zone heat pump condenser
Models: Indoor – MSZ‑WX18NL | Outdoor – MUZ‑WX18NL
Capacities: 18,000 BTU Cooling | 20,800 BTU Heating
Room Size: Ideal for 750 sq ft
Operating Modes: Heating & Cooling
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R‑454B, approx. 2.1 lb

Key Features

• INVERTER Technology: Delivers precise, energy-efficient heating and cooling

• Hyper-Heat Performance: Reliable heating down to -14°F outdoor temperatures

• Compact Design: Slim wall-mounted indoor unit fits small to medium spaces

• Quiet Operation: Indoor sound as low as 31 dB(A) for minimal disruption

• Advanced Filtration: Nano-platinum and enzyme filters capture allergens and odors

• Smart Control Ready: Compatible with wired/wireless remotes and Comfort app

Specifications (Rated Conditions)
Cooling Capacity: 17,200 BTU | EER2: 9.5 | SEER2: 18
Heating Capacity @ 47°F: 18,000 BTU | HSPF2: 8.5 | COP (47°F): 3.14
Heating Capacity @ 17°F: 11,700 BTU
Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 10 A | MOCP: 20 A
Airflow (Dry): 253–473 CFM
Sound Pressure: Indoor 26–42 dB(A) | Outdoor 52–54 dB(A)
Piping: Liquid 1/4 in. | Gas 1/2 in. | Max line length 65 ft | Max height 40 ft
Outdoor Dimensions / Weight: 31-1/2 x 11-1/4 x 21-5/8 in. | 20 lb
Drain Connection: 5/8 in. O.D.

Included Components

• Indoor Unit: MSZ‑WX18NL wall-mounted air handler

• Outdoor Unit: MUZ‑WX18NL heat pump condenser

• Wireless Remote Controller

Ideal For
Homeowners and contractors seeking a quiet, efficient ductless heat pump for medium-sized rooms. The MSZ‑WX18NL & MUZ‑WX18NL deliver dependable, smart-controlled comfort year-round.