Willis / AIR-SOURCE HEAT PUMP
MZUHW18KCH21S2-O
MultiHeat · EPA record 3544191
Source checked Sep 21, 2026
Performance & equipment details
Values below belong to EPA record 3544191. Temperature points and test metrics are preserved as reported. Missing and zero values are not substituted with estimates.
| Metric or attribute | Source value |
|---|---|
| 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 / 8.3°C · BTU/h | 18000 |
| Heating capacity at 17°F / −8.3°C · BTU/h | 15000 |
| Heating capacity at 5°F / −15°C · BTU/h | 13600 |
| COP at 5°F / −15°C | 2.22 |
| Equipment / loop type | HP - Mini or Multi Split |
| Refrigerant / source-reported GWP | R-410A (GWP:2088) |
| Compressor staging | Continuously variable |
| Connected capability | No |
Outdoor-model source rating
EPA reports this outdoor model and its ratings without listing individual indoor units. A complete matched configuration is not available in this record. Do not infer compatibility with a particular indoor unit.
EPA multi-split reporting rules ↗
Outdoor unit
+MZUHW18KCH21S2-OIndoor unit
Indoor configuration not listed by EPAAHRI reference 214810331 · reported by ENERGY STAR; no direct AHRI data connection.
All source records for MZUHW18KCH21S2-O →Specifications & provenance
Every value below is preserved from the source record. Checked Sep 21, 2026. Asterisks and other model wildcards are retained as published.
| Source field | Reported value | Evidence |
|---|---|---|
| pd id | 3544191 | EPA Sep 21, 2026 |
| markets | United States, Canada | EPA Sep 21, 2026 |
| cop at 5 f | 2.22 | EPA Sep 21, 2026 |
| eer2 btu wh | 12.00 | EPA Sep 21, 2026 |
| series name | MultiHeat | EPA Sep 21, 2026 |
| cold climate | Yes | EPA Sep 21, 2026 |
| hspf2 btu wh | 10.00 | EPA Sep 21, 2026 |
| model number | MZUHW18KCH21S2-O | EPA Sep 21, 2026 |
| product type | HP - Mini or Multi Split | EPA Sep 21, 2026 |
| seer2 btu wh | 21.00 | EPA Sep 21, 2026 |
| date certified | 2026-06-13T00:00:00.000 | EPA Sep 21, 2026 |
| manufacturer type | System Manufacturer | EPA Sep 21, 2026 |
| compressor staging | Continuously variable | EPA Sep 21, 2026 |
| energy star partner | 4435273 Canada Inc | EPA Sep 21, 2026 |
| connected capability | No | EPA Sep 21, 2026 |
| refrigerant with gwp | R-410A (GWP:2088) | EPA Sep 21, 2026 |
| ahri reference number | 214810331 | EPA Sep 21, 2026 |
| cooling capacity btu h | 17000 | EPA Sep 21, 2026 |
| indoor unit brand name | WILLIS | EPA Sep 21, 2026 |
| outdoor unit brand name | Willis | EPA Sep 21, 2026 |
| date available on market | 2024-06-11T00:00:00.000 | EPA Sep 21, 2026 |
| energy star model identifier | ES_1128541_MZUHW18KCH21S2-O_06102024232023_6867350 | EPA Sep 21, 2026 |
| heating capacity at 5 f btu h | 13600 | EPA Sep 21, 2026 |
| meets most efficient criteria | Yes | EPA Sep 21, 2026 |
| heating capacity at 17 f btu h | 15000 | EPA Sep 21, 2026 |
| heating capacity at 47 f btu h | 18000 | EPA Sep 21, 2026 |
| meets peak cooling requirements | Yes | EPA Sep 21, 2026 |
| controls verification procedure cvp test | ENERGY STAR CVP Test | EPA Sep 21, 2026 |