G5WZ120BD1*
GeoStar · Geothermal Heat Pump
ENERGY STAR CertifiedGeothermal Heat Pumps →
EER
16.8–20.2BTU/Wh
COP
3.10–3.70
Refrigerant
Other
Rated Across
2loop types
Low EERENERGY STAR Most Efficient
GeoStar G5WZ120BD1*: EER 20.2 BTU/Wh, lower than 90% of geothermal heat pumps (category median 24.1 BTU/Wh).
Where this model sits
EER20.2BTU/Wh
16.1median 24.147.6
Lower than 90% of geothermal heat pumps.
COP3.70
3.10median 4.405.60
The GeoStar G5WZ120BD1* is a 20.2 BTU/Wh geothermal heat pump using Other. At 20.2 BTU/Wh it ranks in the bottom 10% of the 2,204 certified geothermal heat pumps models.
Specifications
| Efficiency | |
|---|---|
| EER (best configuration) | 20.2BTU/Wh |
| EER (worst configuration) | 16.8BTU/Wh |
| COP (best configuration) | 3.70 |
| COP (worst configuration) | 3.10 |
| Configuration | |
| Loop Types Rated | 2 |
| Total Configurations Rated | 2 |
| Model Name | ASTON |
| Refrigerant | Other |
All 14 specifications
| Identifiers | |
|---|---|
| Model Number | G5WZ120BD1* |
| ENERGY STAR ID | ES_1036337_G5WZ120BD1*_01162025160641_02216767348 |
| Partner | WaterFurnace International, Incorporated |
| Date Qualified | 2025-07-23 |
| Available From | 2025-01-13 |
| 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.