Review
The Mitsubishi 42,000 BTU five-zone H2i Hyper Heat system targets a specific market segment: contractors and homeowners in moderate-to-cold climates where efficient heating matters more than cooling capacity. This wall-mounted multi-zone configuration replaces the MXZ-5C42NAHZ2, positioning itself as an upgrade path for aging mini-split installations. The five-zone design (6+6+12+12+15 ton distribution) allows precise control across multiple rooms without the zoning complexity of traditional ducted systems. Online Supply lists this unit with a 21.5 SEER2 rating and Hyper Heat technology, which targets homes transitioning away from natural gas heating.
Performance specs show 42,000 BTU cooling but only 32,000 BTU heating, an unusual split favoring air conditioning despite Hyper Heat branding. The 21.5 SEER2 efficiency rating significantly outperforms baseline mini-splits, translating to real cost savings over 15-20 years. Operating CFM ranges from 191 to 504 for cooling and 191 to 437 for heating, with noise levels staying between 26 and 49 dBA. The 13.4 EER rating confirms solid cooling efficiency, while the 50-amp requirement and 40-45 amp breaker sizing fits standard residential panels.
Pros & Cons
Pros
- 21.5 SEER2 efficiency rating beats most standard mini-splits by 15 to 20 percent
- Hyper Heat technology maintains 32,000 BTU heating output at temperatures standard units can't handle
- Five independent zones allow room-by-room control without aggressive zoning restrictions
- Single-phase 230V electrical keeps installation costs down compared to three-phase requirements
- Wireless controller included, eliminating aftermarket remote expenses
- 13.4 EER provides solid cooling performance across the 191 to 504 CFM range
Cons
- Price listed as $0 raises serious red flags about listing accuracy or incomplete data
- 32,000 BTU heating trails cooling capacity by 10,000 BTU, limiting comfort in extreme cold
- 5-year parts warranty is standard but offers no labor coverage details
- Dimensions show 1/2 inch height and width, which appears to be specification error for wall-mounted unit
Who Should Buy
Best For
Contractors upgrading older homes with multiple rooms in climates where winter heating is primary concern. Homeowners seeking efficient supplemental heating without replacing central systems, especially those in zones 4 through 6.
Consider Alternatives If
Anyone needing pure cooling capacity in hot climates, or buyers who cannot verify actual pricing and complete specifications before purchasing.
Installation
Installation requires 230V single-phase 60Hz power, standard for residential construction without special wiring. The system uses R410A refrigerant with 3/8 inch liquid line and 5/8 inch suction line, typical for this capacity class. A 15-foot line set ships with the unit. Wall mounting requires proper height clearance and condensate drainage to a 5/8 inch drain line. Wireless controller inclusion eliminates additional labor for hardwired thermostat runs.
Warranty & Reliability
The 5-year parts warranty covers manufacturing defects but offers no labor protection details. For contractors, this means extended service call costs after the coverage period ends. For homeowners, parts replacement costs become customer responsibility in year six, making extended warranty purchase advisable if available.
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) | C: 26-49 & H: 26-46 |
| Weight (in lbs) | 15.000000 |
| 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 | 15' |
Frequently Asked Questions
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