Stove Builder International 1.4 Series (Osburn 950 vs Stove Builder International SR-3.2 Series: St-Louis
Both stoves carry the same certified emission rate: 1.8 g/hr. The Stove Builder International SR-3.2 Series: St-Louis is the more efficient unit: 76% versus 74% HHV — more heat from every cord. The Stove Builder International SR-3.2 Series: St-Louis produces more peak heat (83,857 vs 26,500 BTU/h), suiting roughly 2,400–3,350 sq ft. The Stove Builder International SR-3.2 Series: St-Louis has the larger firebox (3.15 vs 1.55 cu ft), which generally means longer burns between reloads.
| Stove Builder International 1.4 Series (Osburn 950 | Stove Builder International SR-3.2 Series: St-Louis | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Non-Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Cord Wood | Crib Wood |
| Emission rate | 1.8 g/hr | 1.8 g/hr |
| Efficiency (HHV) | 74 % | 76 % |
| Heat output (low) | 12100 BTU/h | 29605 BTU/h |
| Heat output (high) | 26500 BTU/h | 83857 BTU/h |
| Firebox volume | 1.55 cu ft | 3.15 cu ft |
| Carbon monoxide | 1.2 g/min | 1.4 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 | 398-25 |
| Test method | — | Alternate Test Method Used |
| 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) | SR-3.2 Series: St-Louis, Helia, Elevate, Chambly, HEA200 |
Frequently asked questions
Which burns cleaner, the Stove Builder International 1.4 Series (Osburn 950 or the Stove Builder International SR-3.2 Series: St-Louis?
They are tied: both are certified at 1.8 g/hr of particulates.
Are the Stove Builder International 1.4 Series (Osburn 950 and Stove Builder International SR-3.2 Series: St-Louis 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.