Jotul North America (Jotul U.S.A., Inc.) F445 V2 vs Kuma Stove And Iron Works K-181 Series: Aspen LE-1
The Jotul North America (Jotul U.S.A., Inc.) F445 V2 is the cleaner burner: 0.65 g/hr certified particulate emissions versus 1.1 g/hr. The Kuma Stove And Iron Works K-181 Series: Aspen LE-1 is the more efficient unit: 78% versus 77% HHV — more heat from every cord. The Jotul North America (Jotul U.S.A., Inc.) F445 V2 produces more peak heat (36,986 vs 29,153 BTU/h), suiting roughly 1,050–1,500 sq ft. The Jotul North America (Jotul U.S.A., Inc.) F445 V2 has the larger firebox (2.03 vs 1.821 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Jotul North America (Jotul U.S.A., Inc.) F445 V2 is a hybrid and the Kuma Stove And Iron Works K-181 Series: Aspen LE-1 a catalytic stove — see the catalytic vs non-catalytic guide for what that means day to day.
| Jotul North America (Jotul U.S.A., Inc.) F445 V2 | Kuma Stove And Iron Works K-181 Series: Aspen LE-1 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Hybrid | Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 0.65 g/hr | 1.1 g/hr |
| Efficiency (HHV) | 77 % | 78 % |
| Heat output (low) | 14323 BTU/h | 12764 BTU/h |
| Heat output (high) | 36986 BTU/h | 29153 BTU/h |
| Firebox volume | 2.03 cu ft | 1.821 cu ft |
| Carbon monoxide | 0.17 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 | 414-26 | 346-23 |
| Covered model numbers | F445 V2 | K-181 Series: Aspen LE-1, Tamarack LE-1, Aberdeen LE-1, and Alpine LE-1 |
Frequently asked questions
Which burns cleaner, the Jotul North America (Jotul U.S.A., Inc.) F445 V2 or the Kuma Stove And Iron Works K-181 Series: Aspen LE-1?
The Jotul North America (Jotul U.S.A., Inc.) F445 V2: 0.65 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 Jotul North America (Jotul U.S.A., Inc.) F445 V2 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.