ZMSB-18HV-USHHR2-O
ZERO · HP - Mini or Multi Split
20.7–24BTU/Wh
11.1–11.4BTU/Wh
16800–18000BTU/hr
Yes
ZERO ZMSB-18HV-USHHR2-O: SEER2 24 BTU/Wh, better than 84% of air-source heat pumps (category median 20 BTU/Wh).
SEER2: better than 83% of the 1837 comparable models within 10% of this capacity. Their median is 21 BTU/Wh.
Where this model sits
Better than 84% of air-source heat pumps.
The ZERO ZMSB-18HV-USHHR2-O is a 18000 BTU/hr hp - mini or multi split using R-454B, a refrigerant with moderate global warming potential (GWP 470). At 24 BTU/Wh it ranks better than 84% 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 21 BTU/Wh. In this size range, comparable Midea models average 21.4 BTU/Wh and TOSOT models average 21 BTU/Wh.
Specifications
| Efficiency | |
|---|---|
| SEER2 (best combination) | 24BTU/Wh |
| SEER2 (worst combination) | 20.7BTU/Wh |
| HSPF2 (best combination) | 11.4BTU/Wh |
| HSPF2 (worst combination) | 11.1BTU/Wh |
| EER2 (best combination) | 13.5BTU/Wh |
| COP at 5 °F | 2.35 |
| Capacity | |
| Cooling Capacity (max) | 18000BTU/hr |
| Cooling Capacity (min) | 16800BTU/hr |
| Heating at 47 °F | 18000BTU/hr |
| Heating at 17 °F | 15000BTU/hr |
| Heating at 5 °F | 13000BTU/hr |
All 25 specifications
| Configuration | |
|---|---|
| Product Type | HP - Mini or Multi Split |
| Compressor Staging | Continuously variable |
| Cold Climate Certified | Yes |
| Connected Capability | No |
| Series | ZMSB Series |
| Indoor-Unit Combinations Rated | 3 |
| Refrigerant | |
| Type | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) |
| Identifiers | |
| Model Number | ZMSB-18HV-USHHR2-O |
| ENERGY STAR ID | ES_1150477_ZMSB-18HV-USHHR2-O_12312025033001_29218043728 |
| Partner | ZERO TECHNOLOGIES HOLDINGS LIMITED |
| Date Certified | 2026-05-12 |
| Available From | 2025-12-31 |
| Markets | United States, Canada |
Documentation
We link to manufacturer documentation at its original source rather than rehosting it, so you always get the current revision.