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Blaze King vs Regency stoves: EPA test data compared
EPA test data checked
Blaze King has 7 and Regency has 8 models certified for sale today. On the EPA's own tests, the typical Blaze King model burns cleaner, and the typical Blaze King model is more efficient.
| Blaze King | Regency | |
|---|---|---|
| Models certified for sale now | 7 | 8 |
| Fuel | wood | wood |
| Catalytic models | 7 | 6 |
| Top heat output, smallest to biggest | 24,085 to 38,516 BTU/hr | 24,488 to 36,398 BTU/hr |
| Typical efficiency (middle model) | 80% | 78% |
| Typical smoke, as a share of the legal limit | 50% | 55% |
| Cleanest-burning model | Princess PE32 | F5200 |
| Most efficient model | 30.2 Series | F5200 |
| Biggest heater | King KE40 | F5200 |
Closest head-to-head matchups
Each Blaze King model paired with the Regency model nearest to it in top heat output, same fuel.
| Blaze King | Heat / efficiency / smoke | Regency | Heat / efficiency / smoke |
|---|---|---|---|
| Sentry S14 | 24,453 / 78% / 1.4 | F1500, I1500 | 24,488 / 78% / 1.0 |
| Princess PI29 Insert | 30,194 / 80% / 1.0 | F2450-2, i2450-2, Hi2450-2 | 29,986 / 70% / 1.6 |
| 30.2 Series | 36,076 / 83% / 0.81 | F5200 | 36,398 / 80% / 0.84 |
| 20.2 Series | 31,092 / 80% / 1.05 | F3500B-1 | 30,659 / 76% / 1.1 |
| 25 Series | 24,085 / 79% / 0.74 | F1500, I1500 | 24,488 / 78% / 1.0 |
| Princess PE32 | 34,435 / 82% / 0.55 | Alterra Pro I3000 Series (I300R, I300A) | 33,155 / 78% / 0.95 |
Heat in BTU an hour, smoke in grams an hour.
Every Blaze King model on the EPA list
- King KE40: wood, 38,516 BTU/hr, 81% efficient, 1.0 g/hr smoke
- 30.2 Series: wood, 36,076 BTU/hr, 83% efficient, 0.81 g/hr smoke
- Princess PE32: wood, 34,435 BTU/hr, 82% efficient, 0.55 g/hr smoke
- 20.2 Series: wood, 31,092 BTU/hr, 80% efficient, 1.05 g/hr smoke
- Princess PI29 Insert: wood, 30,194 BTU/hr, 80% efficient, 1.0 g/hr smoke
- Sentry S14: wood, 24,453 BTU/hr, 78% efficient, 1.4 g/hr smoke
- 25 Series: wood, 24,085 BTU/hr, 79% efficient, 0.74 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.