FPI/Regency Fireplace Products F3500B-1 vs New Buck Corporation (Buck Stove Corp.) Model 91
The FPI/Regency Fireplace Products F3500B-1 is the cleaner burner: 1.1 g/hr certified particulate emissions versus 1.3 g/hr. The New Buck Corporation (Buck Stove Corp.) Model 91 is the more efficient unit: 80% versus 76% HHV — more heat from every cord. The New Buck Corporation (Buck Stove Corp.) Model 91 produces more peak heat (43,190 vs 30,659 BTU/h), suiting roughly 1,250–1,750 sq ft. The New Buck Corporation (Buck Stove Corp.) Model 91 has the larger firebox (3.07 vs 3.024 cu ft), which generally means longer burns between reloads.
| FPI/Regency Fireplace Products F3500B-1 | New Buck Corporation (Buck Stove Corp.) Model 91 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.1 g/hr | 1.3 g/hr |
| Efficiency (HHV) | 76 % | 80 % |
| Heat output (low) | 13650 BTU/h | 14206 BTU/h |
| Heat output (high) | 30659 BTU/h | 43190 BTU/h |
| Firebox volume | 3.024 cu ft | 3.07 cu ft |
| Carbon monoxide | 1.8 g/min | 0.6 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 | 239-19 |
| Covered model numbers | F3500B-1 | Model 91, Carolina 92 |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F3500B-1 or the New Buck Corporation (Buck Stove Corp.) Model 91?
The FPI/Regency Fireplace Products F3500B-1: 1.1 g/hr certified particulate emissions versus 1.3 g/hr for the New Buck Corporation (Buck Stove Corp.) Model 91.
Are the FPI/Regency Fireplace Products F3500B-1 and New Buck Corporation (Buck Stove Corp.) Model 91 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.