Morso Jernstoberi A/S 5660 B
Morso Jernstoberi A/S 5660 B is a non-catalytic wood stove from Morso Jernstoberi A/S certified at 1.2 g/hr particulate emissions with 71% HHV efficiency and a 15,774–43,499 BTU/h output range.
| Appliance type | wood-stove |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Cord Wood |
| Covered model numbers | 5660 B, 5600 B Standard |
| Emission rate | 1.2 g/hr |
|---|---|
| Carbon monoxide | 0.96 g/min |
| Efficiency (HHV) | 71 % |
|---|
| Heat output (low) | 15774 BTU/h |
|---|---|
| Heat output (high) | 43499 BTU/h |
| Firebox volume | 1.15 cu ft |
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | Yes |
| EPA certification number | 285-20 |
What space does the Morso Jernstoberi A/S 5660 B suit?
- Its 43,499 BTU/h peak output covers roughly 1,250–1,750 sq ft at the 25–35 BTU/h-per-square-foot rule of thumb — see the sizing calculator to adjust for your insulation and climate.
- The 1.15 cu ft firebox puts it in the small/cabin class.
- Rough fuel use: about 2.3 cords per season at the midpoint of its output range (8 burn-hours/day, 150-day season, 22 MMBtu/cord — see methodology).
- Certified burning Cord Wood — the test fuel closest to real-world firewood.
Similar wood stoves
- Woodstock Soapstone Company 210a Ideal Steel Hybrid (0.89 g/hr)
- New Buck Corporation (Buck Stove Corp.) Model 91 (1.3 g/hr)
- Hearthstone Quality Home Heating Products WFP100 (1.6 g/hr)
- Stove Builder International HE350 (1.6 g/hr)
- FPI/Regency Fireplace Products I2500 (1 g/hr)
- RSF / Industrial Chimney Company, Incorporated RSF 3600 Series: Pearl 3600 (1.5 g/hr)
Frequently asked questions
Is the Morso Jernstoberi A/S 5660 B EPA certified?
Yes, the Morso Jernstoberi A/S 5660 B is on the EPA's current list of certified wood heaters (certification number 285-20) and meets the 2020 NSPS Step 2 emission limits.
What is the Morso Jernstoberi A/S 5660 B's emission rate?
The Morso Jernstoberi A/S 5660 B is certified at 1.2 grams of particulates per hour (tested with cord wood). Real-world emissions depend heavily on fuel moisture and operation — the lab figure assumes seasoned fuel and correct air settings.
How many square feet can the Morso Jernstoberi A/S 5660 B heat?
Roughly 1,250–1,750 sq ft, estimated from its 43,499 BTU/h peak output at 25–35 BTU/h per square foot. Insulation, climate, ceiling height, and floor plan move this figure substantially in both directions.
Does the Morso Jernstoberi A/S 5660 B qualify for a federal tax credit?
No — the federal 25C credit for biomass stoves was terminated for property placed in service after December 31, 2025. The Morso Jernstoberi A/S 5660 B's certified efficiency is 71% HHV, which did not meet the credit's ≥75% HHV threshold while it existed. State and local incentive programs may still apply — check your state energy office and air district.
Sources
- cfpub.epa.gov (retrieved 2026-07-23)