Hearth and Home Technologies Quadra-Fire 21M-ACC-C 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 1.7 g/hr. The Woodstock Soapstone Company Progress Hybrid 209b is the more efficient unit: 80% versus 76% HHV — more heat from every cord. The Woodstock Soapstone Company Progress Hybrid 209b produces more peak heat (35,222 vs 29,322 BTU/h), suiting roughly 1,000–1,400 sq ft. The Woodstock Soapstone Company Progress Hybrid 209b has the larger firebox (2.8 vs 1.48 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Hearth and Home Technologies Quadra-Fire 21M-ACC-C 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.
| Hearth and Home Technologies Quadra-Fire 21M-ACC-C | Woodstock Soapstone Company Progress Hybrid 209b | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Non-Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.7 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 76 % | 80 % |
| Heat output (low) | 13585 BTU/h | 15257 BTU/h |
| Heat output (high) | 29322 BTU/h | 35222 BTU/h |
| Firebox volume | 1.48 cu ft | 2.8 cu ft |
| Carbon monoxide | 1.5 g/min | 0.07 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 250-20 | 406-25 |
| Covered model numbers | Quadra-Fire 21M-ACC-C, Discovery-1-C, FF-WP-100 | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the Hearth and Home Technologies Quadra-Fire 21M-ACC-C or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 1.7 g/hr for the Hearth and Home Technologies Quadra-Fire 21M-ACC-C.
Are the Hearth and Home Technologies Quadra-Fire 21M-ACC-C 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.