Viessmann D5CURAH24AAK+KSAIC0701230vsZERO ZMSB-24HV-USHH
Side-by-side heat pump comparison
Viessmann D5CURAH24AAK+KSAIC0701230
SEER2
16BTU/Wh
HSPF2
9BTU/Wh
Cooling Capacity
23800BTU/hr
Cold Climate
Yes
Cold climate certified
ZERO ZMSB-24HV-USHH
SEER2
21BTU/Wh
HSPF2
8.5BTU/Wh
Cooling Capacity
24000BTU/hr
Refrigerant
R-410A
GWP 2088 · Higher
Key differences
ZERO ZMSB-24HV-USHH is 24% more efficient at 21.0 BTU/Wh versus 16.0 BTU/Wh for the Viessmann D5CURAH24AAK+KSAIC0701230. The ZERO ZMSB-24HV-USHH is larger at 24000 BTU/hr versus 23800 BTU/hr. Viessmann D5CURAH24AAK+KSAIC0701230 uses a lower-impact refrigerant: R-454B (GWP 470) versus R-410A (GWP 2088). Overall, the ZERO ZMSB-24HV-USHH sits higher in the category, ranking above 44% of certified air-source heat pumps.
Efficiency
| Spec | Viessmann | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 16 | 21 |
| SEER2 (worst combination)(BTU/Wh) | 16 | 21 |
| HSPF2 (best combination)(BTU/Wh) | 9 | 8.5 |
| HSPF2 (worst combination)(BTU/Wh) | 9 | 8.5 |
| EER2 (best combination)(BTU/Wh) | 10 | 13 |
| COP at 5 °F | 1.98 | 1.90 |
Capacity
| Spec | Viessmann | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 23800 | 24000 |
| Cooling Capacity (min)(BTU/hr) | 23800 | 24000 |
| Heating at 47 °F(BTU/hr) | 25400 | 26000 |
| Heating at 17 °F(BTU/hr) | 19400 | 17400 |
| Heating at 5 °F(BTU/hr) | 19800 | 16700 |
Configuration
| Spec | Viessmann | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Mini or Multi Split |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | Yes | No |
| Connected Capability | No | No |
| Series | Crossover Heat Pump | ZMSB Series |
| Indoor-Unit Combinations Rated | 1 | 1 |
Refrigerant
| Spec | Viessmann | ZERO |
|---|---|---|
| Type | R-454B | R-410A |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-410A (GWP:2088) |