Review
The Mitsubishi 42,000 BTU H2i five-zone heat pump represents a mature approach to residential climate control. This wall-mounted mini split system merges cooling, heating, and zone-based comfort into a single footprint. With 21.5 SEER2 efficiency and Hyper Heat technology that maintains performance below freezing, it targets homeowners tired of paying for separate air conditioning and furnace systems. The five-zone capability (9+9+9+9+15 BTU distribution) gives contractors and owners granular control over comfort without installing multiple outdoor units.
Performance metrics justify its positioning. The 42,000 BTU cooling capacity with 13.4 EER handles peak summer loads without excessive runtime, while the 32,000 BTU heating output covers most cold-weather demands through Hyper Heat operation. Airflow ranges from 191-504 CFM in cooling and 191-437 CFM in heating, with noise levels staying below 49 dBA in cooling and 46 dBA in heating. The 21.5 SEER2 rating puts it in the upper tier of ductless mini splits, directly reducing energy costs compared to standard 15-16 SEER equipment.
Pros & Cons
Pros
- 21.5 SEER2 rating delivers excellent cooling efficiency, translating to lower summer utility bills
- Hyper Heat technology maintains heating output at 32,000 BTU even in cold climates down to sub-freezing temperatures
- Five-zone configuration (9+9+9+9+15 layout) allows customized comfort across different rooms or floors
- 13.4 EER rating handles peak cooling demand without excessive energy draw
- Wireless controller included, eliminating added expense and simplifying zone management
- Wall-mounted design takes minimal space and integrates cleanly into modern homes
Cons
- Amperage requirement of 50 amps demands a dedicated 40-45 amp breaker and potentially expensive electrical panel upgrades
- 5-year parts warranty is average for the category, shorter than some premium competitors offering 10-year coverage
- Limited technical documentation, requiring Adobe Reader access for the HW-600 install guide
Who Should Buy
Best For
Homeowners in cold-climate zones replacing fossil fuel heating systems who want single-unit heating and cooling in a 3.5-ton capacity. The Hyper Heat feature and five-zone flexibility make this especially valuable for multi-story homes where room-by-room temperature control matters.
Consider Alternatives If
Anyone with undersized electrical service (under 200-amp main panel) or homes where running 30 feet of refrigerant line to a condensing unit is impractical should explore alternatives.
Installation
Installation requires 230V single-phase, 60Hz power with a dedicated 40-45 amp breaker (50 amps actual draw). Refrigerant line runs up to 30 feet, with 3/8-inch liquid line and 5/8-inch suction line connections standard. The 5/8-inch drain line handles 0.41 gallons per hour dehumidification. Wall-mounted units demand solid framing and proper condensate routing. Most installations take a qualified technician 4-6 hours for new construction or retrofit scenarios.
Warranty & Reliability
Five-year parts coverage protects compressors, circuit boards, and heat exchanger failures without labor included. This standard warranty requires registration and proof of professional installation. For homeowners keeping systems beyond five years, consider purchasing extended coverage at install time, as out-of-warranty repairs on inverter compressors typically exceed 1,200 dollars.
Specifications
| SKU | 216740 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 32,000 |
| Refrigerant | R410A |
| Electrical | 230 V. 1 Phase 60 Hz |
| BTU/Tonnage | 42,000 BTU/3.5 Ton |
| Mini Split Type | Wall Mounted |
| Zone Compatibility | Multi Zone |
| Warranty | 5 Years Parts Warranty |
| Decibel Level (dBA) | C: 26-49 & H: 26-46 |
| Weight (in lbs) | 30.000000 |
| Feature | Spec |
| Controller | Wireless Included |
| Additional Information | Drain: 5/8" |
| Maximum CFM | C: 191-504 & H: 191-437 |
| Capacity | Dehumidification Rate: 0.41 gal/hr |
| Liquid Line | 3/8" |
| Suction Line | 5/8" |
| Operating Mode | Cooling, Heating |
| Height | 1/2" |
| Width | 1/2" |
| Depth | 38" |
| Resources | HW-600 Install Guide You will need Adobe® Acrobat® Reader to view PDF documents. |
| Safety Information | PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here. |
| Phase | Single Phase |
| Replaces | MXZ-5C42NAHZ2 |
| Product Features | Hyper Heat |
| SEER2 (Efficiency) | 21.5 |
| EER | 13.4 |
| Max Breaker Size | 45 amps |
| Min. Breaker Size | 40 |
| Amperage Requirement | 50 |
| Length | 30' |
Frequently Asked Questions
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