Blaze King Industries King KE40 (3) vs FPI/Regency Fireplace Products F3500B-1
The Blaze King Industries King KE40 (3) is the cleaner burner: 1 g/hr certified particulate emissions versus 1.1 g/hr. The Blaze King Industries King KE40 (3) is the more efficient unit: 81% versus 76% HHV — more heat from every cord. The Blaze King Industries King KE40 (3) produces more peak heat (38,516 vs 30,659 BTU/h), suiting roughly 1,100–1,550 sq ft. The Blaze King Industries King KE40 (3) has the larger firebox (4.55 vs 3.024 cu ft), which generally means longer burns between reloads.
| Blaze King Industries King KE40 (3) | FPI/Regency Fireplace Products F3500B-1 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1 g/hr | 1.1 g/hr |
| Efficiency (HHV) | 81 % | 76 % |
| Heat output (low) | 10392 BTU/h | 13650 BTU/h |
| Heat output (high) | 38516 BTU/h | 30659 BTU/h |
| Firebox volume | 4.55 cu ft | 3.024 cu ft |
| Carbon monoxide | 0.49 g/min | 1.8 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 | 358-23 |
| Covered model numbers | King KE40 | F3500B-1 |
Frequently asked questions
Which burns cleaner, the Blaze King Industries King KE40 (3) or the FPI/Regency Fireplace Products F3500B-1?
The Blaze King Industries King KE40 (3): 1 g/hr certified particulate emissions versus 1.1 g/hr for the FPI/Regency Fireplace Products F3500B-1.
Are the Blaze King Industries King KE40 (3) and FPI/Regency Fireplace Products F3500B-1 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.