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Enviro vs Regency stoves: EPA test data compared
EPA test data checked
Enviro has 5 and Regency has 8 models certified for sale today. On the EPA's own tests, the typical Regency model burns cleaner, and the typical Regency model is more efficient.
| Enviro | Regency | |
|---|---|---|
| Models certified for sale now | 5 | 8 |
| Fuel | pellet | wood |
| Catalytic models | 0 | 6 |
| Top heat output, smallest to biggest | 23,892 to 67,020 BTU/hr | 24,488 to 36,398 BTU/hr |
| Typical efficiency (middle model) | 77% | 78% |
| Typical smoke, as a share of the legal limit | 75% | 55% |
| Cleanest-burning model | Enviro Mini 2 | F5200 |
| Most efficient model | Enviro Mini 2 | F5200 |
| Biggest heater | Enviro – Maxx-1 | F5200 |
Every Enviro model on the EPA list
- Enviro – Maxx-1: pellet, 67,020 BTU/hr, 77% efficient, 1.5 g/hr smoke
- Enviro M55-FS-2: pellet, 38,437 BTU/hr, 78% efficient, 1.9 g/hr smoke
- Enviro - Meridian-2: pellet, 32,739 BTU/hr, 75% efficient, 1.8 g/hr smoke
- EF2-1: pellet, 32,134 BTU/hr, 77% efficient, 1.4 g/hr smoke
- Enviro Mini 2: pellet, 23,892 BTU/hr, 80% efficient, 0.54 g/hr smoke
Every Regency model on the EPA list
- F5200: wood, 36,398 BTU/hr, 80% efficient, 0.84 g/hr smoke
- Alterra Pro I3000 Series (I300R, I300A): wood, 33,155 BTU/hr, 78% efficient, 0.95 g/hr smoke
- F3500B-1: wood, 30,659 BTU/hr, 76% efficient, 1.1 g/hr smoke
- F2450-2, i2450-2, Hi2450-2: wood, 29,986 BTU/hr, 70% efficient, 1.6 g/hr smoke
- F2500-1, I2500-1: wood, 29,795 BTU/hr, 78% efficient, 1.4 g/hr smoke
- F1150-1, i1150-1, Ci1150-1, Hi1150-1: wood, 27,353 BTU/hr, 71% efficient, 1.3 g/hr smoke
- CI2700-1, HI500-1: wood, 27,168 BTU/hr, 77% efficient, 1.1 g/hr smoke
- F1500, I1500: wood, 24,488 BTU/hr, 78% efficient, 1.0 g/hr smoke
This compares EPA lab results only. It says nothing about price, build quality, warranty or dealer support.
Source: EPA Certified Wood Heater Database, currently certified room heaters, checked Nov 1, 2026.