Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) 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 0.53 g/hr. They tie on efficiency at 80% HHV. The Woodstock Soapstone Company Progress Hybrid 209b produces more peak heat (35,222 vs 33,424 BTU/h), suiting roughly 1,000–1,400 sq ft. The Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) has the larger firebox (3.16 vs 2.8 cu ft), which generally means longer burns between reloads.
| Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) | Woodstock Soapstone Company Progress Hybrid 209b | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Hybrid | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 0.53 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 80 % | 80 % |
| Heat output (low) | 14846 BTU/h | 15257 BTU/h |
| Heat output (high) | 33424 BTU/h | 35222 BTU/h |
| Firebox volume | 3.16 cu ft | 2.8 cu ft |
| Carbon monoxide | 0.2 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 | 390-25 | 406-25 |
| Covered model numbers | Green Mountain 80-1 (Model 8681), Okemo (Model 8380), Hipster 30 (Model 8280) | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 0.53 g/hr for the Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681).
Are the Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) 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.