Hearth and Home Technologies Quadra-Fire 43M-ACC-C vs Stove Builder International 1.4 Series (Osburn 950
The Hearth and Home Technologies Quadra-Fire 43M-ACC-C is the cleaner burner: 1.6 g/hr certified particulate emissions versus 1.8 g/hr. They tie on efficiency at 74% HHV. The Hearth and Home Technologies Quadra-Fire 43M-ACC-C produces more peak heat (36,757 vs 26,500 BTU/h), suiting roughly 1,050–1,450 sq ft. The Hearth and Home Technologies Quadra-Fire 43M-ACC-C has the larger firebox (2.26 vs 1.55 cu ft), which generally means longer burns between reloads.
| Hearth and Home Technologies Quadra-Fire 43M-ACC-C | Stove Builder International 1.4 Series (Osburn 950 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Non-Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Crib Wood | Cord Wood |
| Emission rate | 1.6 g/hr | 1.8 g/hr |
| Efficiency (HHV) | 74 % | 74 % |
| Heat output (low) | 13239 BTU/h | 12100 BTU/h |
| Heat output (high) | 36757 BTU/h | 26500 BTU/h |
| Firebox volume | 2.26 cu ft | 1.55 cu ft |
| Carbon monoxide | 1.9 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 | 247-20 | 289-21 |
| Covered model numbers | Quadra-Fire 43M-ACC-C, 43ST-ACC-C, Discovery-III-C, FF-WP-300 | 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 Hearth and Home Technologies Quadra-Fire 43M-ACC-C or the Stove Builder International 1.4 Series (Osburn 950?
The Hearth and Home Technologies Quadra-Fire 43M-ACC-C: 1.6 g/hr certified particulate emissions versus 1.8 g/hr for the Stove Builder International 1.4 Series (Osburn 950.
Are the Hearth and Home Technologies Quadra-Fire 43M-ACC-C 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.