Trailmaster Model 4N1-XL II, Gemini XL
Previously certified
EPA lists Trailmaster Model 4N1-XL II, Gemini XL under Appalachian Stove and Fabricators, Inc. as a previously certified catalytic wood stove.
The listed emission rate is 3.4 grams per hour.
EPA does not list an HHV efficiency for this model line.
Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.
EPA rows
| Field | Row 1 |
|---|---|
| Status | Previously certified |
| Type | Wood Stove |
| Subtype | Catalytic Stove |
| Emission | 3.4 grams per hour |
| HHV efficiency | Not listed |
| Heat output | 10,100–26,900 BTU/hr |
| Firebox | Not listed |
| CO | Not listed |
| Certified fuel | Crib Wood |
| Test method | Not listed |
| 2020 NSPS | No |
Retail names in the model line
These are the names split from EPA's model cell. They are aliases for this line, not separate listings.
- Trailmaster Model 4N1-XL II
- Gemini XL
Other model lines from this manufacturer
- 30-CD Previously certified
- 32-BW Previously certified
- 32-BW-XL-88, Gemini-XLB 1989 Previously certified
- 36 BW Previously certified
- 36-BW-1988 Previously certified
- 360-CR Previously certified
- Heritage Classic A Previously certified
- Heritage Classic T16 and VT16 Previously certified
Nearest model lines by EPA figures
Nearest means the smallest absolute difference on that EPA figure, among other Wood Stove model lines that list it. Ties are ordered by model name.
Emission
- 2800 — 3.4 grams per hour
- Alderlea T5, Super 27, Spectrum, Spectrum Classic, Standard, Fusion, Step D1 - Design D — 3.4 grams per hour
- Caldera — 3.4 grams per hour
- Craft CB-4830 Insert — 3.4 grams per hour
- Enviro 1200, 1200I, Vista Flame 1200, 1200I, 1200 Venice (Kodiak, Boston, Cabello) — 3.4 grams per hour
HHV efficiency
EPA does not list an HHV efficiency to compare, or no other line lists one.
Heat output
- Castleton 8031 — 12,501–24,540 BTU/hr
- 100B 90 32 RV — 10,600–26,500 BTU/hr
- FA288 — 7,800–29,300 BTU/hr
- FA288 — 7,800–29,300 BTU/hr
- FA455 — 10,400–26,500 BTU/hr
Appalachian Stove and Fabricators, Inc. hub · EPA Certified Wood Heater Database