FPI/Regency Fireplace Products F3500B-1 vs New Buck Corporation (Buck Stove Corp.) 21NC
The FPI/Regency Fireplace Products F3500B-1 is the cleaner burner: 1.1 g/hr certified particulate emissions versus 1.7 g/hr. The FPI/Regency Fireplace Products F3500B-1 is the more efficient unit: 76% versus 70% HHV — more heat from every cord. The FPI/Regency Fireplace Products F3500B-1 produces more peak heat (30,659 vs 28,901 BTU/h), suiting roughly 900–1,250 sq ft. The FPI/Regency Fireplace Products F3500B-1 has the larger firebox (3.024 vs 1.4 cu ft), which generally means longer burns between reloads. Combustion technology differs: the FPI/Regency Fireplace Products F3500B-1 is a catalytic stove and the New Buck Corporation (Buck Stove Corp.) 21NC a non-catalytic stove — see the catalytic vs non-catalytic guide for what that means day to day.
| FPI/Regency Fireplace Products F3500B-1 | New Buck Corporation (Buck Stove Corp.) 21NC | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.1 g/hr | 1.7 g/hr |
| Efficiency (HHV) | 76 % | 70 % |
| Heat output (low) | 13650 BTU/h | 11079 BTU/h |
| Heat output (high) | 30659 BTU/h | 28901 BTU/h |
| Firebox volume | 3.024 cu ft | 1.4 cu ft |
| Carbon monoxide | 1.8 g/min | 6.1 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | No |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 358-23 | 66-16 |
| Covered model numbers | F3500B-1 | 21NC |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F3500B-1 or the New Buck Corporation (Buck Stove Corp.) 21NC?
The FPI/Regency Fireplace Products F3500B-1: 1.1 g/hr certified particulate emissions versus 1.7 g/hr for the New Buck Corporation (Buck Stove Corp.) 21NC.
Are the FPI/Regency Fireplace Products F3500B-1 and New Buck Corporation (Buck Stove Corp.) 21NC 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.