Blaze King Industries King KE40 (3) vs Stove Builder International SR-3.2 Series: St-Louis
The Blaze King Industries King KE40 (3) is the cleaner burner: 1 g/hr certified particulate emissions versus 1.8 g/hr. The Blaze King Industries King KE40 (3) is the more efficient unit: 81% versus 76% HHV — more heat from every cord. The Stove Builder International SR-3.2 Series: St-Louis produces more peak heat (83,857 vs 38,516 BTU/h), suiting roughly 2,400–3,350 sq ft. The Blaze King Industries King KE40 (3) has the larger firebox (4.55 vs 3.15 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 Stove Builder International SR-3.2 Series: St-Louis a non-catalytic stove — see the catalytic vs non-catalytic guide for what that means day to day.
| Blaze King Industries King KE40 (3) | Stove Builder International SR-3.2 Series: St-Louis | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1 g/hr | 1.8 g/hr |
| Efficiency (HHV) | 81 % | 76 % |
| Heat output (low) | 10392 BTU/h | 29605 BTU/h |
| Heat output (high) | 38516 BTU/h | 83857 BTU/h |
| Firebox volume | 4.55 cu ft | 3.15 cu ft |
| Carbon monoxide | 0.49 g/min | 1.4 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 | 398-25 |
| Test method | — | Alternate Test Method Used |
| Covered model numbers | King KE40 | SR-3.2 Series: St-Louis, Helia, Elevate, Chambly, HEA200 |
Frequently asked questions
Which burns cleaner, the Blaze King Industries King KE40 (3) or the Stove Builder International SR-3.2 Series: St-Louis?
The Blaze King Industries King KE40 (3): 1 g/hr certified particulate emissions versus 1.8 g/hr for the Stove Builder International SR-3.2 Series: St-Louis.
Are the Blaze King Industries King KE40 (3) and Stove Builder International SR-3.2 Series: St-Louis 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.