Blaze King Industries King KE40 (3) 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 g/hr. The Blaze King Industries King KE40 (3) is the more efficient unit: 81% versus 80% HHV — more heat from every cord. The Blaze King Industries King KE40 (3) produces more peak heat (38,516 vs 35,222 BTU/h), suiting roughly 1,100–1,550 sq ft. The Blaze King Industries King KE40 (3) has the larger firebox (4.55 vs 2.8 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Blaze King Industries King KE40 (3) 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 King KE40 (3) | 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 | 1 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 81 % | 80 % |
| Heat output (low) | 10392 BTU/h | 15257 BTU/h |
| Heat output (high) | 38516 BTU/h | 35222 BTU/h |
| Firebox volume | 4.55 cu ft | 2.8 cu ft |
| Carbon monoxide | 0.49 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 | 220-19 | 406-25 |
| Covered model numbers | King KE40 | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the Blaze King Industries King KE40 (3) or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 1 g/hr for the Blaze King Industries King KE40 (3).
Are the Blaze King Industries King KE40 (3) 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.