Jotul North America (Jotul U.S.A., Inc.) F35 vs Stove Builder International 1.4 Series (Osburn 950
The Jotul North America (Jotul U.S.A., Inc.) F35 is the cleaner burner: 1.2 g/hr certified particulate emissions versus 1.8 g/hr. The Stove Builder International 1.4 Series (Osburn 950 is the more efficient unit: 74% versus 69% HHV — more heat from every cord. The Jotul North America (Jotul U.S.A., Inc.) F35 produces more peak heat (59,443 vs 26,500 BTU/h), suiting roughly 1,700–2,400 sq ft. The Jotul North America (Jotul U.S.A., Inc.) F35 has the larger firebox (1.57 vs 1.55 cu ft), which generally means longer burns between reloads.
| Jotul North America (Jotul U.S.A., Inc.) F35 | Stove Builder International 1.4 Series (Osburn 950 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Non-Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Cord Wood | Cord Wood |
| Emission rate | 1.2 g/hr | 1.8 g/hr |
| Efficiency (HHV) | 69 % | 74 % |
| Heat output (low) | 13533 BTU/h | 12100 BTU/h |
| Heat output (high) | 59443 BTU/h | 26500 BTU/h |
| Firebox volume | 1.57 cu ft | 1.55 cu ft |
| Carbon monoxide | 1.35 g/min | 1.2 g/min |
| 25C tax credit eligible (≥75% HHV) | No | No |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 317-22 | 289-21 |
| Covered model numbers | F35 | 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) |
Frequently asked questions
Which burns cleaner, the Jotul North America (Jotul U.S.A., Inc.) F35 or the Stove Builder International 1.4 Series (Osburn 950?
The Jotul North America (Jotul U.S.A., Inc.) F35: 1.2 g/hr certified particulate emissions versus 1.8 g/hr for the Stove Builder International 1.4 Series (Osburn 950.
Are the Jotul North America (Jotul U.S.A., Inc.) F35 and Stove Builder International 1.4 Series (Osburn 950 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.