WEATHERMAKER PH5SAN518**AA*vsZERO Z4SOV-18HDMB-USHH
Side-by-side heat pump comparison
WEATHERMAKER PH5SAN518**AA*
SEER2
15.2–15.5BTU/Wh
HSPF2
7.8–8BTU/Wh
Cooling Capacity
17400–18900BTU/hr
Refrigerant
R-454B
GWP 470 · Lower
ZERO Z4SOV-18HDMB-USHH
SEER2
20–21BTU/Wh
HSPF2
10BTU/Wh
Cooling Capacity
19000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
ZERO Z4SOV-18HDMB-USHH is 26% more efficient at 21.0 BTU/Wh versus 15.5 BTU/Wh for the WEATHERMAKER PH5SAN518**AA*. The ZERO Z4SOV-18HDMB-USHH is larger at 19000 BTU/hr versus 18900 BTU/hr. Overall, the ZERO Z4SOV-18HDMB-USHH sits higher in the category, ranking above 37% of certified air-source heat pumps.
Efficiency
| Spec | WEATHERMAKER | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 15.5 | 21 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 20 |
| HSPF2 (best combination)(BTU/Wh) | 8 | 10 |
| HSPF2 (worst combination)(BTU/Wh) | 7.8 | 10 |
| EER2 (best combination)(BTU/Wh) | 12.5 | 13 |
| COP at 5 °F | 2.10 | 2 |
Capacity
| Spec | WEATHERMAKER | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 18900 | 19000 |
| Cooling Capacity (min)(BTU/hr) | 17400 | 19000 |
| Heating at 47 °F(BTU/hr) | 18300 | 20000 |
| Heating at 17 °F(BTU/hr) | 11000 | 20000 |
| Heating at 5 °F(BTU/hr) | 8600 | 18000 |
Configuration
| Spec | WEATHERMAKER | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Mini or Multi Split |
| Compressor Staging | Single stage | Continuously variable |
| Cold Climate Certified | No | Yes |
| Connected Capability | No | No |
| Series | 15 SEER2 HP | Z4S Series |
| Indoor-Unit Combinations Rated | 38 | 3 |
Refrigerant
| Spec | WEATHERMAKER | ZERO |
|---|---|---|
| Type | R-454B | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-454B (GWP:470 | Lower GWP) |