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The Midea MO3EX-H18B-2A is an 18,000 BTU multi-zone heat pump outdoor unit designed to connect up to three compatible indoor units for year-round heating and cooling. Featuring high efficiency ratings and R454B refrigerant, it delivers reliable comfort while allowing independent temperature control in multiple rooms.
The Midea MO3EX-H18B-2A outdoor heat pump is designed for homeowners seeking efficient heating and cooling across multiple rooms using a single outdoor unit. Compatible with a wide range of ductless and ducted indoor units, this multi-zone system allows each room to maintain its own independent temperature setting while maximizing overall energy efficiency.
Rated at 18,000 BTU, this outdoor unit supports up to three indoor units and offers impressive seasonal efficiency ratings of up to 25.1 SEER2, 9.8 HSPF2, and 14 EER2. The inverter-driven twin rotary compressor continuously adjusts system output to match demand, reducing energy consumption while maintaining consistent indoor comfort.
The unit utilizes environmentally improved R454B refrigerant, helping reduce environmental impact compared with previous refrigerants while maintaining excellent system performance.
Professional installation is essential to ensure proper refrigerant piping lengths, electrical sizing, condensate drainage, refrigerant charging, and system commissioning. Correct sizing of both the outdoor and indoor units ensures optimal comfort, quiet operation, and long equipment life.
Because every home has unique heating and cooling requirements, our technicians perform a complete system assessment before recommending the appropriate indoor unit combination and installation layout.
| Specification | Value |
|---|---|
| Model | MO3EX-H18B-2A |
| Product Type | Multi-Zone Heat Pump Outdoor Unit |
| Rated Cooling Capacity | 18,000 BTU/hr |
| Cooling Capacity Range | 5,400–21,600 BTU/hr |
| Rated Heating Capacity | 19,000 BTU/hr |
| Heating Capacity @47°F | 19,000 BTU/hr |
| Heating Capacity Range @47°F | 5,700–21,600 BTU/hr |
| Heating Capacity @17°F | 13,600 BTU/hr |
| Heating Capacity @5°F | 13,500 BTU/hr |
| SEER2 | 25.1 |
| HSPF2 | 9.8 |
| EER2 | 14 |
| COP | 3.8 |
| Refrigerant | R454B |
| Compressor | Twin Rotary |
| Voltage | 208/230V, 60Hz, 1 Phase |
| MCA | 16.0 A |
| MOCP | 20 A |
| Compressor RLA | 8.2 A |
| Outdoor Fan Motor | 80 W |
| Outdoor Noise Level | 59.5 dBA |
| Liquid Line | 3 × 1/4 in |
| Gas Line | 3 × 3/8 in |
| Maximum Total Piping | 197 ft (60 m) |
| Maximum Single Zone Piping | 98 ft (30 m) |
| Maximum Elevation Difference | 49 ft (15 m) |
| Operating Cooling Range | -13°F to 122°F |
| Operating Heating Range | -13°F to 75°F |
| Dimensions | 35-1/16 × 13-7/16 × 26-1/2 in |
| Net Weight | 101 lb |
| Model | Capacity | Recommended Home Size | Occupants |
|---|---|---|---|
| MO3EX-H18B-2A | 18,000 BTU | Approximately 1,000–1,600 sq ft (depending on design load and indoor unit selection) | 2–5 occupants |
Multi-zone ODU Installation Manual
Step 1 – Request an Installation Quote Contact 4Most Energy for a consultation.
Step 2 – Home Assessment Our specialists evaluate your home's heating and cooling requirements.
Step 3 – System Design Compatible indoor units are selected and properly sized.
Step 4 – Installation Scheduling A convenient installation date is arranged.
Step 5 – Removal of Existing Equipment Existing equipment is safely removed if required.
Installation includes:
Step 7 – Testing & Safety Inspection The entire system is pressure tested, commissioned and verified for proper operation.
Step 8 – Final Walkthrough Our technician explains system operation and maintenance requirements.
The MO3EX-H18B-2A includes the manufacturer's limited parts warranty (subject to product registration and manufacturer terms). 4Most Energy also provides a labour warranty on qualifying professional installations.
If a warranty issue arises, our service team will inspect the system, verify eligibility, and coordinate the claim process with the manufacturer.
To help maintain efficiency and extend equipment life, optional maintenance plans are available starting from $12.99/month. Benefits include scheduled inspections, system cleaning, performance checks, and priority service.
