FPI/Regency Fireplace Products F3500B-1 vs Woodstock Soapstone Company Progress Hybrid 209b
The Woodstock Soapstone Company Progress Hybrid 209b is the cleaner burner: 0.46 g/hr certified particulate emissions versus 1.1 g/hr. The Woodstock Soapstone Company Progress Hybrid 209b is the more efficient unit: 80% versus 76% HHV — more heat from every cord. The Woodstock Soapstone Company Progress Hybrid 209b produces more peak heat (35,222 vs 30,659 BTU/h), suiting roughly 1,000–1,400 sq ft. The FPI/Regency Fireplace Products F3500B-1 has the larger firebox (3.024 vs 2.8 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 Woodstock Soapstone Company Progress Hybrid 209b a hybrid — see the catalytic vs non-catalytic guide for what that means day to day.
| FPI/Regency Fireplace Products F3500B-1 | Woodstock Soapstone Company Progress Hybrid 209b | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.1 g/hr | 0.46 g/hr |
| Efficiency (HHV) | 76 % | 80 % |
| Heat output (low) | 13650 BTU/h | 15257 BTU/h |
| Heat output (high) | 30659 BTU/h | 35222 BTU/h |
| Firebox volume | 3.024 cu ft | 2.8 cu ft |
| Carbon monoxide | 1.8 g/min | 0.07 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 | 406-25 |
| Covered model numbers | F3500B-1 | Progress Hybrid 209b |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F3500B-1 or the Woodstock Soapstone Company Progress Hybrid 209b?
The Woodstock Soapstone Company Progress Hybrid 209b: 0.46 g/hr certified particulate emissions versus 1.1 g/hr for the FPI/Regency Fireplace Products F3500B-1.
Are the FPI/Regency Fireplace Products F3500B-1 and Woodstock Soapstone Company Progress Hybrid 209b 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.