Stove Builder International 1.4 Series (Osburn 950 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 1.8 g/hr. The Woodstock Soapstone Company Progress Hybrid 209b is the more efficient unit: 80% versus 74% HHV — more heat from every cord. The Woodstock Soapstone Company Progress Hybrid 209b produces more peak heat (35,222 vs 26,500 BTU/h), suiting roughly 1,000–1,400 sq ft. The Woodstock Soapstone Company Progress Hybrid 209b has the larger firebox (2.8 vs 1.55 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Stove Builder International 1.4 Series (Osburn 950 is a non-catalytic stove and the Woodstock Soapstone Company Progress Hybrid 209b a hybrid — see the catalytic vs non-catalytic guide for what that means day to day.
| Stove Builder International 1.4 Series (Osburn 950 | Woodstock Soapstone Company Progress Hybrid 209b | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Non-Catalytic Stove | Hybrid |
| Certified fuel | Cord Wood | Crib Wood |
| Emission rate | 1.8 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 74 % | 80 % |
| Heat output (low) | 12100 BTU/h | 15257 BTU/h |
| Heat output (high) | 26500 BTU/h | 35222 BTU/h |
| Firebox volume | 1.55 cu ft | 2.8 cu ft |
| Carbon monoxide | 1.2 g/min | 0.07 g/min |
| 25C tax credit eligible (≥75% HHV) | No | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 289-21 | 406-25 |
| Covered model numbers | 1.4 Series (Osburn 950, Escape 1200, Gateway 1400, Solution 1.4, Spark II, Fox, Déco Nano, S250, Harmony 1.4, HES140, Blue Ridge 100) | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the Stove Builder International 1.4 Series (Osburn 950 or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 1.8 g/hr for the Stove Builder International 1.4 Series (Osburn 950.
Are the Stove Builder International 1.4 Series (Osburn 950 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.