Spartherm S 600 Insert
Spartherm S 600 Insert is a non-catalytic wood stove from Spartherm certified at 1.7 g/hr particulate emissions with 70% HHV efficiency and a 10,613–47,417 BTU/h output range (previously certified, no longer in production).
Previously certified (out of production). This model appears in the EPA Certified Wood Heater Database but is no longer on the current certified list, which usually means it is no longer manufactured. The specifications below are its certified figures, kept for reference and for owners of installed units. Browse currently certified heaters for models sold new today.
| Appliance type | wood-stove |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Cord Wood |
| Covered model numbers | Spartherm S 600 Insert, Spartherm S 600 ZC, Spartherm S 600 Module |
| Emission rate | 1.7 g/hr |
|---|---|
| Carbon monoxide | 0.97 g/min |
| Efficiency (HHV) | 70 % |
|---|
| Heat output (low) | 10613 BTU/h |
|---|---|
| Heat output (high) | 47417 BTU/h |
| Firebox volume | 0.95 cu ft |
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | No |
| EPA certification number | 219-19a |
What space does the Spartherm S 600 Insert suit?
- Its 47,417 BTU/h peak output covers roughly 1,350–1,900 sq ft at the 25–35 BTU/h-per-square-foot rule of thumb — see the sizing calculator to adjust for your insulation and climate.
- The 0.95 cu ft firebox puts it in the small/cabin class.
- Rough fuel use: about 2.3 cords per season at the midpoint of its output range (8 burn-hours/day, 150-day season, 22 MMBtu/cord — see methodology).
- Certified burning Cord Wood — the test fuel closest to real-world firewood.
Similar wood stoves
- Travis Industries 36 Elite NexGen-Hybrid (0.6 g/hr)
- Woodstock Soapstone Company 209a Progress Hybrid (0.63 g/hr)
- Travis Industries Liberty NexGen-Hybrid (0.9 g/hr)
- FPI/Regency Fireplace Products F5200 (0.9 g/hr)
- Pacific Energy Fireplace Products Limited FP16 LE (1.4 g/hr)
- Wolf Steel Napoleon EPI3C (1.2 g/hr)
Frequently asked questions
Is the Spartherm S 600 Insert EPA certified?
The Spartherm S 600 Insert holds EPA certification number 219-19a but is no longer on the current certified list — it is previously certified, which usually means the model is out of production. Already-installed units are unaffected by that status in most jurisdictions.
What is the Spartherm S 600 Insert's emission rate?
The Spartherm S 600 Insert is certified at 1.7 grams of particulates per hour (tested with cord wood). Real-world emissions depend heavily on fuel moisture and operation — the lab figure assumes seasoned fuel and correct air settings.
How many square feet can the Spartherm S 600 Insert heat?
Roughly 1,350–1,900 sq ft, estimated from its 47,417 BTU/h peak output at 25–35 BTU/h per square foot. Insulation, climate, ceiling height, and floor plan move this figure substantially in both directions.
Does the Spartherm S 600 Insert qualify for a federal tax credit?
No — the federal 25C credit for biomass stoves was terminated for property placed in service after December 31, 2025. The Spartherm S 600 Insert's certified efficiency is 70% HHV, which did not meet the credit's ≥75% HHV threshold while it existed. State and local incentive programs may still apply — check your state energy office and air district.
Sources
- cfpub.epa.gov (retrieved 2026-07-23)