FPI/Regency Fireplace Products F3500B-1 vs Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT
The Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT is the cleaner burner: 0.3 g/hr certified particulate emissions versus 1.1 g/hr. The Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT is the more efficient unit: 77% versus 76% HHV — more heat from every cord. The FPI/Regency Fireplace Products F3500B-1 produces more peak heat (30,659 vs 15,906 BTU/h), suiting roughly 900–1,250 sq ft. The FPI/Regency Fireplace Products F3500B-1 has the larger firebox (3.024 vs 1.31 cu ft), which generally means longer burns between reloads.
| FPI/Regency Fireplace Products F3500B-1 | Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.1 g/hr | 0.3 g/hr |
| Efficiency (HHV) | 76 % | 77 % |
| Heat output (low) | 13650 BTU/h | 10665 BTU/h |
| Heat output (high) | 30659 BTU/h | 15906 BTU/h |
| Firebox volume | 3.024 cu ft | 1.31 cu ft |
| Carbon monoxide | 1.8 g/min | 0.82 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 | 115-18 |
| Covered model numbers | F3500B-1 | Vermont Castings Intrepid FlexBurn 2115-CAT |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F3500B-1 or the Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT?
The Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT: 0.3 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 Hearth and Home Technologies Vermont Castings Intrepid FlexBurn 2115-CAT 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.