Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert vs Hearth and Home Technologies Quadra-Fire 21M-ACC-C
The Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert is the cleaner burner: 0.74 g/hr certified particulate emissions versus 1.7 g/hr. The Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert is the more efficient unit: 79% versus 76% HHV — more heat from every cord. The Hearth and Home Technologies Quadra-Fire 21M-ACC-C produces more peak heat (29,322 vs 24,085 BTU/h), suiting roughly 850–1,150 sq ft. The Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert has the larger firebox (2.08 vs 1.48 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 Hearth and Home Technologies Quadra-Fire 21M-ACC-C a non-catalytic stove — see the catalytic vs non-catalytic guide for what that means day to day.
| Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert | Hearth and Home Technologies Quadra-Fire 21M-ACC-C | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Non-Catalytic Stove |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 0.74 g/hr | 1.7 g/hr |
| Efficiency (HHV) | 79 % | 76 % |
| Heat output (low) | 8038 BTU/h | 13585 BTU/h |
| Heat output (high) | 24085 BTU/h | 29322 BTU/h |
| Firebox volume | 2.08 cu ft | 1.48 cu ft |
| Carbon monoxide | 0.21 g/min | 1.5 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 | 250-20 |
| Covered model numbers | 25 Series: Sirocco 25 (SC25) Insert, Ashford 25 (AF25) Insert, Boxer 24 (BX24) Freestanding | Quadra-Fire 21M-ACC-C, Discovery-1-C, FF-WP-100 |
Frequently asked questions
Which burns cleaner, the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert or the Hearth and Home Technologies Quadra-Fire 21M-ACC-C?
The Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert: 0.74 g/hr certified particulate emissions versus 1.7 g/hr for the Hearth and Home Technologies Quadra-Fire 21M-ACC-C.
Are the Blaze King Industries 25 Series: Sirocco 25 (SC25) Insert and Hearth and Home Technologies Quadra-Fire 21M-ACC-C 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.