Spartherm S 600 Insert (2)
Spartherm S 600 Insert (2) is a non-catalytic wood stove from Spartherm certified at 1.8 g/hr particulate emissions with 62% HHV efficiency and a 20,345–21,299 BTU/h output range.
| Appliance type | wood-stove |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Crib Wood |
| Covered model numbers | Spartherm S 600 Insert, Spartherm S 600 ZC, Spartherm S 600 Module |
| Emission rate | 1.8 g/hr |
|---|---|
| Carbon monoxide | 0.8 g/min |
| Efficiency (HHV) | 62 % |
|---|
| Heat output (low) | 20345 BTU/h |
|---|---|
| Heat output (high) | 21299 BTU/h |
| Firebox volume | 0.94 cu ft |
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | Yes |
| EPA certification number | 219-19 |
What space does the Spartherm S 600 Insert (2) suit?
- Its 21,299 BTU/h peak output covers roughly 600–850 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 0.94 cu ft firebox puts it in the small/cabin class.
- Rough fuel use: about 1.8 cords per season at the midpoint of its output range (8 burn-hours/day, 150-day season, 22 MMBtu/cord — see methodology).
- Certified burning Crib Wood .
Similar wood stoves
- Hearth and Home Technologies Vermont Castings by Forge and Flame Dauntless-C (1.7 g/hr)
- Hearth and Home Technologies Heat & Glo Pioneer-II-ARC (1.7 g/hr)
- Wittus Shaker (1.8 g/hr)
- MF Fire Nova 2C (1.4 g/hr)
- J. A. Roby Cook (1.9 g/hr)
- J. A. Roby Polaris (1.4 g/hr)
Frequently asked questions
Is the Spartherm S 600 Insert (2) EPA certified?
Yes, the Spartherm S 600 Insert (2) is on the EPA's current list of certified wood heaters (certification number 219-19) and meets the 2020 NSPS Step 2 emission limits.
What is the Spartherm S 600 Insert (2)'s emission rate?
The Spartherm S 600 Insert (2) is certified at 1.8 grams of particulates per hour (tested with crib 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 (2) heat?
Roughly 600–850 sq ft, estimated from its 21,299 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 (2) 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 (2)'s certified efficiency is 62% 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)