Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert 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 0.74 g/hr. The Woodstock Soapstone Company Progress Hybrid 209b is the more efficient unit: 80% versus 79% HHV — more heat from every cord. The Woodstock Soapstone Company Progress Hybrid 209b produces more peak heat (35,222 vs 24,085 BTU/h), suiting roughly 1,000–1,400 sq ft. The Woodstock Soapstone Company Progress Hybrid 209b has the larger firebox (2.8 vs 2.08 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert is a 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.
| Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert | Woodstock Soapstone Company Progress Hybrid 209b | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 0.74 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 79 % | 80 % |
| Heat output (low) | 8038 BTU/h | 15257 BTU/h |
| Heat output (high) | 24085 BTU/h | 35222 BTU/h |
| Firebox volume | 2.08 cu ft | 2.8 cu ft |
| Carbon monoxide | 0.21 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 | 30-16 | 406-25 |
| Covered model numbers | 25 Series: Sirocco 25 (SC25) Insert, Ashford 25 (AF25) Insert, Boxer 24 (BX24) Freestanding | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 0.74 g/hr for the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert.
Are the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert 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.