Grandaire W4H7T36*K*AAA*vsZERO ZMSB-33HV-USHHCR2-O
Side-by-side heat pump comparison
Grandaire W4H7T36*K*AAA*
SEER2
15.2BTU/Wh
HSPF2
8.1BTU/Wh
Cooling Capacity
33200BTU/hr
Refrigerant
R-410A
GWP 2088 · Higher
ZERO ZMSB-33HV-USHHCR2-O
SEER2
20BTU/Wh
HSPF2
10.5BTU/Wh
Cooling Capacity
33000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
ZERO ZMSB-33HV-USHHCR2-O is 24% more efficient at 20.0 BTU/Wh versus 15.2 BTU/Wh for the Grandaire W4H7T36*K*AAA*. The Grandaire W4H7T36*K*AAA* is larger at 33200 BTU/hr versus 33000 BTU/hr. ZERO ZMSB-33HV-USHHCR2-O uses a lower-impact refrigerant: R-454B (GWP 470) versus R-410A (GWP 2088). Overall, the ZERO ZMSB-33HV-USHHCR2-O sits higher in the category, ranking above 64% of certified air-source heat pumps.
Efficiency
| Spec | Grandaire | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 15.2 | 20 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 20 |
| HSPF2 (best combination)(BTU/Wh) | 8.1 | 10.5 |
| HSPF2 (worst combination)(BTU/Wh) | 8.1 | 10.5 |
| EER2 (best combination)(BTU/Wh) | 11.7 | 11.7 |
| COP at 5 °F | — | 1.91 |
Capacity
| Spec | Grandaire | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 33200 | 33000 |
| Cooling Capacity (min)(BTU/hr) | 33200 | 33000 |
| Heating at 47 °F(BTU/hr) | 34600 | 36000 |
| Heating at 17 °F(BTU/hr) | 21200 | 31000 |
| Heating at 5 °F(BTU/hr) | — | 34600 |
Configuration
| Spec | Grandaire | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Mini or Multi Split |
| Compressor Staging | Two-stage | Continuously variable |
| Cold Climate Certified | No | Yes |
| Connected Capability | No | No |
| Series | 2-STAGE 17 SEER HP | ZMSB Series |
| Indoor-Unit Combinations Rated | 1 | 2 |
Refrigerant
| Spec | Grandaire | ZERO |
|---|---|---|
| Type | R-410A | R-454B |
| GWP Rating | R-410A (GWP:2088) | R-454B (GWP:470 | Lower GWP) |