Mitsubishi 18,000 BTU GX-Series 22.5 SEER2 Single Zone Wall Mount Mini Split Heat Pump System - R454B | 230V

Mitsubishi GX-Series 18K BTU Single-Zone Ductless Mini Split Heat Pump

High-efficiency Mitsubishi comfort for one dedicated space. This GX-Series ductless mini split pairs the MUZ-GX18NL outdoor heat pump with the MSZ-GX18NL wall-mounted indoor unit for powerful heating and cooling without adding ductwork.

With 18,000 BTU of rated cooling, 21,600 BTU of rated heating, and 22.5 SEER2 efficiency, this system is a strong fit for larger bedrooms, living areas, finished basements, additions, and open rooms where comfort, efficiency, and individual room control all matter.

Not sure if 18K is the right size? Confirm your room load, insulation, sun exposure, and installation plan before ordering so the system is matched correctly to the space.

At a Glance:

Best For	One-zone heating and cooling with a high-efficiency wall-mounted indoor unit
System Models	MUZ-GX18NL outdoor unit + MSZ-GX18NL indoor unit
Capacity	18,000 BTU cooling / 21,600 BTU heating
Efficiency	22.5 SEER2 / 14.05 EER2 / 10.3 HSPF2
Low-Temperature Heating Capacity	15,200 BTU at 5F
Voltage	208/230V, 1 phase
Refrigerant	R-454B
Controls	Handheld remote included / WiFi built in
Installation Type	Professional HVAC installation recommended

Why Choose This Mitsubishi GX System?

• Higher-efficiency single-zone comfort: GX is a strong fit when you want Mitsubishi performance with efficiency ratings above the entry-level tier.
• Dedicated room control: Heat and cool one room or area without tying that space to a central duct system.
• Efficient inverter performance: Mitsubishi inverter technology adjusts output as conditions change, helping maintain steadier comfort than basic on/off systems.
• Cold-weather support: Rated heating capacity at 5F is 15,200 BTU for this matched system.
• Built-in WiFi: The GX wall-mounted indoor unit is listed in the catalog with handheld remote and WiFi built in.
• Modern R-454B refrigerant: Built for Mitsubishi's current R-454B equipment generation.
• Warranty confidence: Mitsubishi lists extended warranty coverage when eligible equipment is properly registered, subject to warranty terms and installation requirements.

What Is Included?

• 1 Mitsubishi MUZ-GX18NL outdoor heat pump condenser
• 1 Mitsubishi MSZ-GX18NL wall-mounted indoor air handler
• Handheld remote control capability for the indoor unit

Before You Order:

• Have your installer confirm the room load and that a 18K system is appropriate for the space.
• Confirm line-set length, indoor and outdoor placement, condensate routing, electrical requirements, and local code requirements before purchase.
• This is not a DIY quick-connect system. Refrigerant piping, evacuation, electrical work, startup, and commissioning should be handled by a qualified HVAC professional.
• Line sets, wall brackets, disconnects, pads, electrical materials, and installation accessories may be sold separately unless specifically included.

Frequently Asked Questions:

What makes this different from WX or HX?
GX is the high-efficiency standard heat pump wall-mounted tier in this catalog. WX is the entry-level tier, while HX is a 20 SEER2 mid-tier option.

Does this system heat and cool?
Yes. This is a heat pump system designed for both air conditioning and heating.

Is WiFi included?
The Team Air catalog notes that MSZ-GX wall-mounted indoor units come with handheld remote and WiFi built in.

Is this a DIY system?
No. This Mitsubishi system should be installed by a qualified HVAC professional.

Does it use R-454B refrigerant?
Yes. The MUZ-GX18NL / MSZ-GX18NL system is part of Mitsubishi's R-454B equipment lineup.

Specifications:

BRAND NAME	Mitsubishi
SERIES	GX-Series
SYSTEM TYPE	Ductless mini split heat pump
OUTDOOR MODEL	MUZ-GX18NL
INDOOR MODEL	MSZ-GX18NL
ZONE CAPACITY	1 zone
COOLING CAPACITY	18,000 BTU
HEATING CAPACITY	21,600 BTU
HEATING CAPACITY AT 5F	15,200 BTU
AHRI CERTIFICATE NUMBER	215862736
SEER2	22.5
EER2	14.05
HSPF2	10.3
REFRIGERANT TYPE	R-454B
POWER SUPPLY	208/230V, 1 phase
MAX OVERCURRENT PROTECTION	40 A
LINE SET SIZE	1/4 in liquid / 1/2 in gas
OUTDOOR DIMENSIONS	33 in W x 35 in H x 13 in D
INDOOR DIMENSIONS	43-5/16 in W x 12-13/16 in H x 10-1/8 in D
REGISTERED WARRANTY	10-year parts and compressor limited warranty when registered within 90 days; terms apply
NON-REGISTERED WARRANTY	5-year parts / 7-year compressor limited warranty; terms apply