FPI/Regency Fireplace Products F3500B-1 vs Stove Builder International SR-3.2 Series: St-Louis
The FPI/Regency Fireplace Products F3500B-1 is the cleaner burner: 1.1 g/hr certified particulate emissions versus 1.8 g/hr. They tie on efficiency at 76% HHV. The Stove Builder International SR-3.2 Series: St-Louis produces more peak heat (83,857 vs 30,659 BTU/h), suiting roughly 2,400–3,350 sq ft. The Stove Builder International SR-3.2 Series: St-Louis has the larger firebox (3.15 vs 3.024 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 Stove Builder International SR-3.2 Series: St-Louis a non-catalytic stove — see the catalytic vs non-catalytic guide for what that means day to day.
| FPI/Regency Fireplace Products F3500B-1 | Stove Builder International SR-3.2 Series: St-Louis | |
|---|---|---|
| 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 | 1.8 g/hr |
| Efficiency (HHV) | 76 % | 76 % |
| Heat output (low) | 13650 BTU/h | 29605 BTU/h |
| Heat output (high) | 30659 BTU/h | 83857 BTU/h |
| Firebox volume | 3.024 cu ft | 3.15 cu ft |
| Carbon monoxide | 1.8 g/min | 1.4 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 | 398-25 |
| Test method | — | Alternate Test Method Used |
| Covered model numbers | F3500B-1 | SR-3.2 Series: St-Louis, Helia, Elevate, Chambly, HEA200 |
Frequently asked questions
Which burns cleaner, the FPI/Regency Fireplace Products F3500B-1 or the Stove Builder International SR-3.2 Series: St-Louis?
The FPI/Regency Fireplace Products F3500B-1: 1.1 g/hr certified particulate emissions versus 1.8 g/hr for the Stove Builder International SR-3.2 Series: St-Louis.
Are the FPI/Regency Fireplace Products F3500B-1 and Stove Builder International SR-3.2 Series: St-Louis 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.