FPI/Regency Fireplace Products F3500B-1 vs Kuma Stove And Iron Works K-251 Series: Ashwood LE-1
Both stoves carry the same certified emission rate: 1.1 g/hr. The Kuma Stove And Iron Works K-251 Series: Ashwood LE-1 is the more efficient unit: 78% versus 76% HHV — more heat from every cord. The FPI/Regency Fireplace Products F3500B-1 produces more peak heat (30,659 vs 30,612 BTU/h), suiting roughly 900–1,250 sq ft. The FPI/Regency Fireplace Products F3500B-1 has the larger firebox (3.024 vs 2.56 cu ft), which generally means longer burns between reloads.
| FPI/Regency Fireplace Products F3500B-1 | Kuma Stove And Iron Works K-251 Series: Ashwood LE-1 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.1 g/hr | 1.1 g/hr |
| Efficiency (HHV) | 76 % | 78 % |
| Heat output (low) | 13650 BTU/h | 11219 BTU/h |
| Heat output (high) | 30659 BTU/h | 30612 BTU/h |
| Firebox volume | 3.024 cu ft | 2.56 cu ft |
| Carbon monoxide | 1.8 g/min | 0.49 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 358-23 | 357-23 |
| Covered model numbers | F3500B-1 | K-251 Series: Ashwood LE-1, Wood Classic LE-1, Cambridge LE-1, Cascade LE-1 |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F3500B-1 or the Kuma Stove And Iron Works K-251 Series: Ashwood LE-1?
They are tied: both are certified at 1.1 g/hr of particulates.
Are the FPI/Regency Fireplace Products F3500B-1 and Kuma Stove And Iron Works K-251 Series: Ashwood LE-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.