Hearthstone Quality Home Heating Products Green Mountain 60 8660 vs Woodstock Soapstone Company Progress Hybrid 209b
The Woodstock Soapstone Company Progress Hybrid 209b is the cleaner burner: 0.46 g/hr certified particulate emissions versus 0.6 g/hr. The Woodstock Soapstone Company Progress Hybrid 209b is the more efficient unit: 80% versus 79% HHV — more heat from every cord. The Woodstock Soapstone Company Progress Hybrid 209b produces more peak heat (35,222 vs 33,576 BTU/h), suiting roughly 1,000–1,400 sq ft. The Woodstock Soapstone Company Progress Hybrid 209b has the larger firebox (2.8 vs 2.03 cu ft), which generally means longer burns between reloads.
| Hearthstone Quality Home Heating Products Green Mountain 60 8660 | Woodstock Soapstone Company Progress Hybrid 209b | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Hybrid | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 0.6 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 79 % | 80 % |
| Heat output (low) | 12608 BTU/h | 15257 BTU/h |
| Heat output (high) | 33576 BTU/h | 35222 BTU/h |
| Firebox volume | 2.03 cu ft | 2.8 cu ft |
| Carbon monoxide | 0.49 g/min | 0.07 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 121-18 | 406-25 |
| Covered model numbers | Green Mountain 60 8660, Hipster 20 AMB8260, Shelburne 8372 | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the Hearthstone Quality Home Heating Products Green Mountain 60 8660 or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 0.6 g/hr for the Hearthstone Quality Home Heating Products Green Mountain 60 8660.
Are the Hearthstone Quality Home Heating Products Green Mountain 60 8660 and Woodstock Soapstone Company Progress Hybrid 209b both EPA certified?
Yes — both appear on the U.S. EPA's current list of certified wood heaters, and every figure on this page comes from their certification records.