Blaze King Industries King KE40 (3) vs Blaze King Industries Princess PI29 Insert (2)
Both stoves carry the same certified emission rate: 1 g/hr. The Blaze King Industries King KE40 (3) is the more efficient unit: 81% versus 80% HHV — more heat from every cord. The Blaze King Industries King KE40 (3) produces more peak heat (38,516 vs 30,194 BTU/h), suiting roughly 1,100–1,550 sq ft. The Blaze King Industries King KE40 (3) has the larger firebox (4.55 vs 2.63 cu ft), which generally means longer burns between reloads.
| Blaze King Industries King KE40 (3) | Blaze King Industries Princess PI29 Insert (2) | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1 g/hr | 1 g/hr |
| Efficiency (HHV) | 81 % | 80 % |
| Heat output (low) | 10392 BTU/h | 9023 BTU/h |
| Heat output (high) | 38516 BTU/h | 30194 BTU/h |
| Firebox volume | 4.55 cu ft | 2.63 cu ft |
| Carbon monoxide | 0.49 g/min | 0.704 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 220-19 | 123-18 |
| Covered model numbers | King KE40 | Princess PI29 Insert |
Frequently asked questions
Which burns cleaner, the Blaze King Industries King KE40 (3) or the Blaze King Industries Princess PI29 Insert (2)?
They are tied: both are certified at 1 g/hr of particulates.
Are the Blaze King Industries King KE40 (3) and Blaze King Industries Princess PI29 Insert (2) 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.