Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert vs Hearthstone Quality Home Heating Products Clydesdale 8492
The Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert is the cleaner burner: 0.74 g/hr certified particulate emissions versus 1.16 g/hr. They tie on efficiency at 79% HHV. The Hearthstone Quality Home Heating Products Clydesdale 8492 produces more peak heat (32,588 vs 24,085 BTU/h), suiting roughly 950–1,300 sq ft. The Hearthstone Quality Home Heating Products Clydesdale 8492 has the larger firebox (2.35 vs 2.08 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert is a catalytic stove and the Hearthstone Quality Home Heating Products Clydesdale 8492 a hybrid — see the catalytic vs non-catalytic guide for what that means day to day.
| Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert | Hearthstone Quality Home Heating Products Clydesdale 8492 | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 0.74 g/hr | 1.16 g/hr |
| Efficiency (HHV) | 79 % | 79 % |
| Heat output (low) | 8038 BTU/h | 14829 BTU/h |
| Heat output (high) | 24085 BTU/h | 32588 BTU/h |
| Firebox volume | 2.08 cu ft | 2.35 cu ft |
| Carbon monoxide | 0.21 g/min | 1.1 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 30-16 | 305-22 |
| Covered model numbers | 25 Series: Sirocco 25 (SC25) Insert, Ashford 25 (AF25) Insert, Boxer 24 (BX24) Freestanding | Clydesdale 8492 |
Frequently asked questions
Which burns cleaner, the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert or the Hearthstone Quality Home Heating Products Clydesdale 8492?
The Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert: 0.74 g/hr certified particulate emissions versus 1.16 g/hr for the Hearthstone Quality Home Heating Products Clydesdale 8492.
Are the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert and Hearthstone Quality Home Heating Products Clydesdale 8492 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.