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Blaze King vs Kuma stoves: EPA test data compared
EPA test data checked
Blaze King has 7 and Kuma has 2 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 | Kuma | |
|---|---|---|
| Models certified for sale now | 7 | 2 |
| Fuel | wood | wood |
| Catalytic models | 7 | 2 |
| Top heat output, smallest to biggest | 24,085 to 38,516 BTU/hr | 29,153 to 30,612 BTU/hr |
| Typical efficiency (middle model) | 80% | 78% |
| Typical smoke, as a share of the legal limit | 50% | 55% |
| Cleanest-burning model | Princess PE32 | K-181 Series |
| Most efficient model | 30.2 Series | K-181 Series |
| Biggest heater | King KE40 | K-251 Series |
Closest head-to-head matchups
Each Blaze King model paired with the Kuma model nearest to it in top heat output, same fuel.
| Blaze King | Heat / efficiency / smoke | Kuma | Heat / efficiency / smoke |
|---|---|---|---|
| Princess PI29 Insert | 30,194 / 80% / 1.0 | K-251 Series | 30,612 / 78% / 1.1 |
| 20.2 Series | 31,092 / 80% / 1.05 | K-251 Series | 30,612 / 78% / 1.1 |
| Princess PE32 | 34,435 / 82% / 0.55 | K-251 Series | 30,612 / 78% / 1.1 |
| 30.2 Series | 36,076 / 83% / 0.81 | K-251 Series | 30,612 / 78% / 1.1 |
| Sentry S14 | 24,453 / 78% / 1.4 | K-181 Series | 29,153 / 78% / 1.1 |
| King KE40 | 38,516 / 81% / 1.0 | K-251 Series | 30,612 / 78% / 1.1 |
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 Kuma model on the EPA list
- K-251 Series: wood, 30,612 BTU/hr, 78% efficient, 1.1 g/hr smoke
- K-181 Series: wood, 29,153 BTU/hr, 78% efficient, 1.1 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.