Westinghouse / AIR-SOURCE HEAT PUMP
WHP18SZA21S
Hi UNI · EPA record 2635333
Source checked Sep 21, 2026
Performance & equipment details
Values below belong to EPA record 2635333. 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 | 22.50 |
| EER2 · BTU/Wh | 13.00 |
| HSPF2 · BTU/Wh | 8.60 |
| 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 | 10000 |
| Heating capacity at 5°F / −15°C · BTU/h | 12700 |
| COP at 5°F / −15°C | 1.80 |
| 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
+WHP18SZA21SIndoor unit
WHP18WMA21SAHRI reference 205417836 · reported by ENERGY STAR; no direct AHRI data connection.
All source records for WHP18SZA21S →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 | 2635333 | EPA Sep 21, 2026 |
| markets | United States, Canada | EPA Sep 21, 2026 |
| cop at 5 f | 1.80 | EPA Sep 21, 2026 |
| eer2 btu wh | 13.00 | EPA Sep 21, 2026 |
| series name | Hi UNI | EPA Sep 21, 2026 |
| cold climate | Yes | EPA Sep 21, 2026 |
| hspf2 btu wh | 8.60 | EPA Sep 21, 2026 |
| model number | WHP18SZA21S | EPA Sep 21, 2026 |
| product type | HP - Mini or Multi Split | EPA Sep 21, 2026 |
| seer2 btu wh | 22.50 | 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 | 205417836 | 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 | 2023-07-16T00:00:00.000 | EPA Sep 21, 2026 |
| indoor unit model number | WHP18WMA21S | EPA Sep 21, 2026 |
| energy star model identifier | ES_28426_WHP18SZA21S_07162023102438_1329280 | EPA Sep 21, 2026 |
| heating capacity at 5 f btu h | 12700 | EPA Sep 21, 2026 |
| meets most efficient criteria | Yes | EPA Sep 21, 2026 |
| heating capacity at 17 f btu h | 10000 | 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 |