Blaze King Industries King KE40 (3) vs Hearthstone Quality Home Heating Products Green Mountain 80 8680
The Hearthstone Quality Home Heating Products Green Mountain 80 8680 is the cleaner burner: 0.67 g/hr certified particulate emissions versus 1 g/hr. They tie on efficiency at 81% HHV. The Blaze King Industries King KE40 (3) produces more peak heat (38,516 vs 33,396 BTU/h), suiting roughly 1,100–1,550 sq ft. The Blaze King Industries King KE40 (3) has the larger firebox (4.55 vs 3.16 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Blaze King Industries King KE40 (3) is a catalytic stove and the Hearthstone Quality Home Heating Products Green Mountain 80 8680 a hybrid — see the catalytic vs non-catalytic guide for what that means day to day.
| Blaze King Industries King KE40 (3) | Hearthstone Quality Home Heating Products Green Mountain 80 8680 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1 g/hr | 0.67 g/hr |
| Efficiency (HHV) | 81 % | 81 % |
| Heat output (low) | 10392 BTU/h | 15069 BTU/h |
| Heat output (high) | 38516 BTU/h | 33396 BTU/h |
| Firebox volume | 4.55 cu ft | 3.16 cu ft |
| Carbon monoxide | 0.49 g/min | 0.23 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 | 162-18 |
| Covered model numbers | King KE40 | Green Mountain 80 8680 |
Frequently asked questions
Which burns cleaner, the Blaze King Industries King KE40 (3) or the Hearthstone Quality Home Heating Products Green Mountain 80 8680?
The Hearthstone Quality Home Heating Products Green Mountain 80 8680: 0.67 g/hr certified particulate emissions versus 1 g/hr for the Blaze King Industries King KE40 (3).
Are the Blaze King Industries King KE40 (3) and Hearthstone Quality Home Heating Products Green Mountain 80 8680 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.