FPI/Regency Fireplace Products F1500 vs Kuma Stove And Iron Works K-181 Series: Aspen LE-1
The FPI/Regency Fireplace Products F1500 is the cleaner burner: 1 g/hr certified particulate emissions versus 1.1 g/hr. They tie on efficiency at 78% HHV. The Kuma Stove And Iron Works K-181 Series: Aspen LE-1 produces more peak heat (29,153 vs 24,488 BTU/h), suiting roughly 850–1,150 sq ft. The Kuma Stove And Iron Works K-181 Series: Aspen LE-1 has the larger firebox (1.821 vs 0.98 cu ft), which generally means longer burns between reloads.
| FPI/Regency Fireplace Products F1500 | Kuma Stove And Iron Works K-181 Series: Aspen LE-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) | 78 % | 78 % |
| Heat output (low) | 14244 BTU/h | 12764 BTU/h |
| Heat output (high) | 24488 BTU/h | 29153 BTU/h |
| Firebox volume | 0.98 cu ft | 1.821 cu ft |
| Carbon monoxide | 0.32 g/min | 0.45 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 73-16 | 346-23 |
| Covered model numbers | F1500, I1500 | K-181 Series: Aspen LE-1, Tamarack LE-1, Aberdeen LE-1, and Alpine LE-1 |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F1500 or the Kuma Stove And Iron Works K-181 Series: Aspen LE-1?
The FPI/Regency Fireplace Products F1500: 1 g/hr certified particulate emissions versus 1.1 g/hr for the Kuma Stove And Iron Works K-181 Series: Aspen LE-1.
Are the FPI/Regency Fireplace Products F1500 and Kuma Stove And Iron Works K-181 Series: Aspen 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.