G5SZ066BD1
GeoStar · Geothermal Heat Pump
ENERGY STAR CertifiedGeothermal Heat Pumps →
EER
20.2–25.1BTU/Wh
COP
3.90–4.30
Refrigerant
Other
Rated Across
2loop types
ENERGY STAR Most Efficient
GeoStar G5SZ066BD1: EER 25.1 BTU/Wh, around the middle of the range for geothermal heat pumps (category median 24.1 BTU/Wh).
Where this model sits
EER25.1BTU/Wh
16.1median 24.147.6
COP4.30
3.10median 4.405.60
The GeoStar G5SZ066BD1 is a 25.1 BTU/Wh geothermal heat pump using Other. At 25.1 BTU/Wh it ranks around the middle of the 2,204 certified geothermal heat pumps models.
Specifications
| Efficiency | |
|---|---|
| EER (best configuration) | 25.1BTU/Wh |
| EER (worst configuration) | 20.2BTU/Wh |
| COP (best configuration) | 4.30 |
| COP (worst configuration) | 3.90 |
| Configuration | |
| Loop Types Rated | 2 |
| Total Configurations Rated | 4 |
| Model Name | ASTON |
| Refrigerant | Other |
All 14 specifications
| Identifiers | |
|---|---|
| Model Number | G5SZ066BD1 |
| ENERGY STAR ID | ES_1036337_G5SZ066BD1_01182025003244_02216759835 |
| Partner | WaterFurnace International, Incorporated |
| Date Qualified | 2026-01-15 |
| Available From | 2025-01-02 |
| 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.