Guardian RHP15024B21vsZERO ZSOVA-24HDMB-US
Side-by-side heat pump comparison
Guardian RHP15024B21
SEER2
15.2BTU/Wh
HSPF2
7.8BTU/Wh
Cooling Capacity
23000–24200BTU/hr
Refrigerant
R-410A
GWP 2088 · Higher
ZERO ZSOVA-24HDMB-US
SEER2
18.1BTU/Wh
HSPF2
9.7BTU/Wh
Cooling Capacity
24000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
ZERO ZSOVA-24HDMB-US is 16% more efficient at 18.1 BTU/Wh versus 15.2 BTU/Wh for the Guardian RHP15024B21. The Guardian RHP15024B21 is larger at 24200 BTU/hr versus 24000 BTU/hr. ZERO ZSOVA-24HDMB-US uses a lower-impact refrigerant: R-454B (GWP 470) versus R-410A (GWP 2088). Overall, the ZERO ZSOVA-24HDMB-US sits higher in the category, ranking above 44% of certified air-source heat pumps.
Efficiency
| Spec | Guardian | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 15.2 | 18.1 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 18.1 |
| HSPF2 (best combination)(BTU/Wh) | 7.8 | 9.7 |
| HSPF2 (worst combination)(BTU/Wh) | 7.8 | 9.7 |
| EER2 (best combination)(BTU/Wh) | 12 | 11 |
| COP at 5 °F | 2.20 | 1.87 |
Capacity
| Spec | Guardian | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 24200 | 24000 |
| Cooling Capacity (min)(BTU/hr) | 23000 | 24000 |
| Heating at 47 °F(BTU/hr) | 22400 | 26000 |
| Heating at 17 °F(BTU/hr) | 14300 | 20800 |
| Heating at 5 °F(BTU/hr) | 12000 | 21600 |
Configuration
| Spec | Guardian | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Split System |
| Compressor Staging | Two-stage | Continuously variable |
| Cold Climate Certified | No | Yes |
| Connected Capability | No | No |
| Series | LX SERIES | ZAVA Series |
| Indoor-Unit Combinations Rated | 2 | 1 |
Refrigerant
| Spec | Guardian | ZERO |
|---|---|---|
| Type | R-410A | R-454B |
| GWP Rating | R-410A (GWP:2088) | R-454B (GWP:470 | Lower GWP) |