Review
The Mitsubishi 42,000 BTU five-zone H2i represents the high-end of mini-split technology for contractors serious about quality installations. This system replaces the older MXZ-5C42NAHZ2 model with meaningful efficiency and performance improvements. The 21.5 SEER2 rating positions it among the most efficient multi-zone options available. Wall-mounted design suits space-constrained homes, while the five independent zones let occupants customize comfort room by room without compromising central control.
Performance specs impress across the board. The system delivers 42,000 BTU cooling capacity paired with 32,000 BTU heating output, making it viable for true four-season climates. Hyper Heat technology keeps the compressor effective below freezing, critical for northern installations. The 13.4 EER rating ensures summer cooling efficiency won't degrade under peak demand. Variable CFM output from 109-406 delivers flexible operation from whisper-quiet to full capacity, with decibel levels ranging 19-43 dBA.
Pros & Cons
Pros
- 21.5 SEER2 efficiency rating beats most competitors in the multi-zone category, lowering utility costs
- 42,000 BTU cooling with 32,000 BTU heating handles both seasons effectively across five zones
- Hyper Heat technology maintains performance down to extreme cold temperatures for northern climates
- Wireless controller included, eliminating retrofit costs and simplifying temperature management
- 13.4 EER provides solid cooling efficiency even at peak summer demand
- 5-year parts warranty covers major component failures during critical early ownership years
Cons
- Zone configuration (6+6+6+6+9 BTU split) may not match all home layouts perfectly
- 50-amp electrical requirement demands professional installation and potential panel upgrades
- Decibel range of 19-43 dBA indicates noise variation depending on capacity stage
Who Should Buy
Best For
Contractors installing retrofits in existing homes with multiple rooms needing independent temperature control, and homeowners in mixed climates who want efficient heating and cooling without separate systems. The 21.5 SEER2 rating justifies higher upfront costs through long-term energy savings.
Consider Alternatives If
Budget-conscious buyers seeking basic single-zone cooling, or homes with simple heating needs where zoning doesn't add value.
Installation
Installation demands professional expertise. The system requires 230V single-phase 60Hz power with a 40-45 amp breaker and 50-amp service capacity, meaning many homes need electrical work before setup. The 5/8-inch drain line, 3/8-inch liquid line, and 5/8-inch suction line need proper routing and insulation. The included wireless controller simplifies indoor unit placement, but refrigerant charging and zone balancing require certified technician skills.
Warranty & Reliability
The 5-year parts warranty covers compressor failures, motor defects, and refrigerant leaks during the crucial early ownership window. This protection is standard for Mitsubishi units but doesn't cover labor or accessories. Many contractors bundle extended warranties. For zone systems, failure of one outdoor unit affects all five zones, making this warranty especially valuable.
Specifications
| SKU | 201813 |
| 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) | 19-43 |
| Weight (in lbs) | 15.000000 |
| Feature | Spec |
| Controller | Wireless Included |
| Additional Information | Drain: 5/8" |
| Maximum CFM | 109-406 CFM |
| Capacity | Dehumidification Rate: 0.23 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. |
| 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 | 15' |
Frequently Asked Questions
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