Westinghouse / AIR-SOURCE HEAT PUMP
WHU18SZA21S
Hi UNI · EPA record 2414839
Source checked Sep 21, 2026
Performance & equipment details
Values below belong to EPA record 2414839. 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 | 20.50 |
| EER2 · BTU/Wh | 12.50 |
| HSPF2 · BTU/Wh | 10.00 |
| Cooling capacity · BTU/h | 18000 |
| Heating capacity at 47°F / 8.3°C · BTU/h | 18000 |
| Heating capacity at 17°F / −8.3°C · BTU/h | 12000 |
| Heating capacity at 5°F / −15°C · BTU/h | 13200 |
| COP at 5°F / −15°C | 2.36 |
| Equipment / loop type | HP - Mini or Multi Split |
| Refrigerant / source-reported GWP | R-410A (GWP:2088) |
| Compressor staging | Continuously variable |
| Connected capability | No |
This listed system
These ratings apply to the listed configuration. Changing a component may change performance.
Outdoor unit
+WHU18SZA21SIndoor unit
WHU18CTA21SAHRI reference 207237537 · reported by ENERGY STAR; no direct AHRI data connection.
All source records for WHU18SZA21S →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 | 2414839 | EPA Sep 21, 2026 |
| markets | United States, Canada | EPA Sep 21, 2026 |
| cop at 5 f | 2.36 | EPA Sep 21, 2026 |
| eer2 btu wh | 12.50 | EPA Sep 21, 2026 |
| series name | Hi UNI | EPA Sep 21, 2026 |
| cold climate | Yes | EPA Sep 21, 2026 |
| hspf2 btu wh | 10.00 | EPA Sep 21, 2026 |
| model number | WHU18SZA21S | EPA Sep 21, 2026 |
| product type | HP - Mini or Multi Split | EPA Sep 21, 2026 |
| seer2 btu wh | 20.50 | EPA Sep 21, 2026 |
| date certified | 2026-06-09T00:00:00.000 | EPA Sep 21, 2026 |
| manufacturer type | System Manufacturer | EPA Sep 21, 2026 |
| compressor staging | Continuously variable | EPA Sep 21, 2026 |
| energy star partner | Fujitsu General America, 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 | 207237537 | EPA Sep 21, 2026 |
| cooling capacity btu h | 18000 | EPA Sep 21, 2026 |
| indoor unit brand name | WESTINGHOUSE | EPA Sep 21, 2026 |
| outdoor unit brand name | Westinghouse | EPA Sep 21, 2026 |
| date available on market | 2023-03-03T00:00:00.000 | EPA Sep 21, 2026 |
| indoor unit model number | WHU18CTA21S | EPA Sep 21, 2026 |
| energy star model identifier | ES_28426_WHU18SZA21S_03032023014136_6751668 | EPA Sep 21, 2026 |
| heating capacity at 5 f btu h | 13200 | EPA Sep 21, 2026 |
| meets most efficient criteria | Yes | EPA Sep 21, 2026 |
| heating capacity at 17 f btu h | 12000 | 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 |