Blaze King Industries King KE40 (3) vs Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640)
The Blaze King Industries King KE40 (3) is the cleaner burner: 1 g/hr certified particulate emissions versus 1.1 g/hr. The Blaze King Industries King KE40 (3) is the more efficient unit: 81% versus 79% HHV — more heat from every cord. The Blaze King Industries King KE40 (3) produces more peak heat (38,516 vs 31,581 BTU/h), suiting roughly 1,100–1,550 sq ft. The Blaze King Industries King KE40 (3) has the larger firebox (4.55 vs 1.32 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 40 Series: Green Mountain 40 (8640) 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 40 Series: Green Mountain 40 (8640) | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1 g/hr | 1.1 g/hr |
| Efficiency (HHV) | 81 % | 79 % |
| Heat output (low) | 10392 BTU/h | 13876 BTU/h |
| Heat output (high) | 38516 BTU/h | 31581 BTU/h |
| Firebox volume | 4.55 cu ft | 1.32 cu ft |
| Carbon monoxide | 0.49 g/min | 0.52 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 | 210-19 |
| Covered model numbers | King KE40 | Green Mountain 40 Series: Green Mountain 40 (8640), Craftsbury 2 (8392), Hipster 14 (AMB8240) |
Frequently asked questions
Which burns cleaner, the Blaze King Industries King KE40 (3) or the Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640)?
The Blaze King Industries King KE40 (3): 1 g/hr certified particulate emissions versus 1.1 g/hr for the Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640).
Are the Blaze King Industries King KE40 (3) and Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) 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.