MZUHW42KCH21S2-O
Willis · HP - Mini or Multi Split
21BTU/Wh
10BTU/Wh
36000BTU/hr
Yes
Willis MZUHW42KCH21S2-O: SEER2 21 BTU/Wh, around the middle of the range for air-source heat pumps (category median 20 BTU/Wh).
Where this model sits
The Willis MZUHW42KCH21S2-O is a 36000 BTU/hr hp - mini or multi split using R-410A, a refrigerant with high global warming potential (GWP 2088). At 21 BTU/Wh it ranks around the middle of the 12,218 certified air-source heat pumps models. Among similar-sized air-source heat pumps (within 10% of its size), it is more efficient than the peer median of 19 BTU/Wh. In this size range, comparable Midea models average 20 BTU/Wh and TOSOT models average 21 BTU/Wh.
Specifications
| Efficiency | |
|---|---|
| SEER2 (best combination) | 21BTU/Wh |
| SEER2 (worst combination) | 21BTU/Wh |
| HSPF2 (best combination) | 10BTU/Wh |
| HSPF2 (worst combination) | 10BTU/Wh |
| EER2 (best combination) | 12BTU/Wh |
| COP at 5 °F | 1.92 |
| Capacity | |
| Cooling Capacity (max) | 36000BTU/hr |
| Cooling Capacity (min) | 36000BTU/hr |
| Heating at 47 °F | 40000BTU/hr |
| Heating at 17 °F | 35600BTU/hr |
| Heating at 5 °F | 32400BTU/hr |
All 25 specifications
| Configuration | |
|---|---|
| Product Type | HP - Mini or Multi Split |
| Compressor Staging | Continuously variable |
| Cold Climate Certified | Yes |
| Connected Capability | No |
| Series | MultiHeat |
| Indoor-Unit Combinations Rated | 1 |
| Refrigerant | |
| Type | R-410A |
| GWP Rating | R-410A (GWP:2088) |
| Identifiers | |
| Model Number | MZUHW42KCH21S2-O |
| ENERGY STAR ID | ES_1128541_MZUHW42KCH21S2-O_06102024232016_412108 |
| Partner | 4435273 Canada Inc |
| Date Certified | 2026-06-13 |
| Available From | 2024-06-11 |
| Markets | United States, Canada |
Documentation
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