Hearth and Home Technologies Quadra-Fire 21M-ACC-C vs Stove Builder International 1.4R Series: Osburn 950 N
Both stoves carry the same certified emission rate: 1.7 g/hr. The Hearth and Home Technologies Quadra-Fire 21M-ACC-C is the more efficient unit: 76% versus 74% HHV — more heat from every cord. The Stove Builder International 1.4R Series: Osburn 950 N produces more peak heat (71,279 vs 29,322 BTU/h), suiting roughly 2,050–2,850 sq ft. The Stove Builder International 1.4R Series: Osburn 950 N has the larger firebox (1.67 vs 1.48 cu ft), which generally means longer burns between reloads.
| Hearth and Home Technologies Quadra-Fire 21M-ACC-C | Stove Builder International 1.4R Series: Osburn 950 N | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Non-Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Crib Wood | Cord Wood |
| Emission rate | 1.7 g/hr | 1.7 g/hr |
| Efficiency (HHV) | 76 % | 74 % |
| Heat output (low) | 13585 BTU/h | 18785 BTU/h |
| Heat output (high) | 29322 BTU/h | 71279 BTU/h |
| Firebox volume | 1.48 cu ft | 1.67 cu ft |
| Carbon monoxide | 1.5 g/min | 1.3 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | No |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 250-20 | 412-26 |
| Covered model numbers | Quadra-Fire 21M-ACC-C, Discovery-1-C, FF-WP-100 | 1.4R Series: Osburn 950 N, Escape 1200 N, Gateway 1400 N, Solution 1.4 N, Spark II N, Fox N, Deco Nano N, S250 N, HES140 N, Blue Ridge 100 N, SP1400 N, SL1400 N |
Frequently asked questions
Which burns cleaner, the Hearth and Home Technologies Quadra-Fire 21M-ACC-C or the Stove Builder International 1.4R Series: Osburn 950 N?
They are tied: both are certified at 1.7 g/hr of particulates.
Are the Hearth and Home Technologies Quadra-Fire 21M-ACC-C and Stove Builder International 1.4R Series: Osburn 950 N 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.