Willis MZUHW18KCH21S2-O heat pump (AHRI 214810331)
Willis MZUHW18KCH21S2-O heat pump (AHRI 214810331) appears in the U.S. EPA ENERGY STAR "Certified Heat Pumps" dataset, which lists outdoor and indoor unit combinations certified to the program specification (record 3544191, certified 2026-06-13). 1 certified indoor/outdoor combination of outdoor model MZUHW18KCH21S2-O share these rated values. EPA publishes these values: SEER2 (Btu/Wh) 21.00; EER2 (Btu/Wh) 12.00; HSPF2 (Btu/Wh) 10.00; Cooling capacity (Btu/h) 17000; Heating capacity at 47 °F (Btu/h) 18000; Heating capacity at 17 °F (Btu/h) 15000; Heating capacity at 5 °F (Btu/h) 13600; COP at 5 °F 2.22; Product type HP - Mini or Multi Split; Cold climate Yes. The listing records ENERGY STAR certification and the rated values reported to EPA. It is not a determination that any building, installation or design complies with a code.
Specifications
| Series | MultiHeat |
| Refrigerant | R-410A (GWP:2088) |
| COP at 5 °F | 2.22 |
| Cold climate | Yes |
| Product type | HP - Mini or Multi Split |
| EER2 (Btu/Wh) | 12.00 |
| HSPF2 (Btu/Wh) | 10.00 |
| SEER2 (Btu/Wh) | 21.00 |
| Compressor staging | Continuously variable |
| Connected capability | No |
| Cooling capacity (Btu/h) | 17000 |
| Meets most efficient criteria | Yes |
| Meets peak cooling requirements | Yes |
| Heating capacity at 5 °F (Btu/h) | 13600 |
| Heating capacity at 17 °F (Btu/h) | 15000 |
| Heating capacity at 47 °F (Btu/h) | 18000 |
| AHRI reference number (lowest in group) | 214810331 |
| Certified combinations with these ratings | 1 |