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ComfortBilt vs US Stove stoves: EPA test data compared
EPA test data checked
ComfortBilt has 8 and US Stove has 27 models certified for sale today. On the EPA's own tests, the typical ComfortBilt model burns cleaner, and the typical ComfortBilt model is more efficient.
| ComfortBilt | US Stove | |
|---|---|---|
| Models certified for sale now | 8 | 27 |
| Fuel | pellet | pellet, wood |
| Catalytic models | 0 | 0 |
| Top heat output, smallest to biggest | 26,224 to 43,298 BTU/hr | 12,161 to 50,470 BTU/hr |
| Typical efficiency (middle model) | 80% | 73% |
| Typical smoke, as a share of the legal limit | 65% | 70% |
| Cleanest-burning model | HP 40 | Breckwell SP2047 |
| Most efficient model | HP42-Alpine | 5710E |
| Biggest heater | HP75C | US2500E |
Closest head-to-head matchups
Each ComfortBilt model paired with the US Stove model nearest to it in top heat output, same fuel.
| ComfortBilt | Heat / efficiency / smoke | US Stove | Heat / efficiency / smoke |
|---|---|---|---|
| ComfortBilt HP50S | 39,170 / 80% / 1.7 | SP1000E, KP1000E, AP1000E, US1000E | 39,121 / 75% / 1.0 |
| HP 21 | 31,753 / 76% / 1.5 | Breckwell SP1000, Big E | 31,935 / 66% / 1.5 |
| HP 40 | 26,224 / 81% / 0.74 | 5780, AP5780, VG5780, SP5780, and SP58 | 26,386 / 72% / 1.3 |
| HP41 - Alpine | 32,155 / 80% / 1.6 | Breckwell SP1000, Big E | 31,935 / 66% / 1.5 |
| HP 61 | 39,769 / 80% / 1.2 | SP1000E, KP1000E, AP1000E, US1000E | 39,121 / 75% / 1.0 |
| ComfortBilt HP22N, HP22, and HP22i Insert | 40,689 / 81% / 1.0 | SP1000E, KP1000E, AP1000E, US1000E | 39,121 / 75% / 1.0 |
Heat in BTU an hour, smoke in grams an hour.
Every ComfortBilt model on the EPA list
- HP75C: pellet, 43,298 BTU/hr, 81% efficient, 1.4 g/hr smoke
- HP42-Alpine: pellet, 42,370 BTU/hr, 86% efficient, 1.1 g/hr smoke
- ComfortBilt HP22N, HP22, and HP22i Insert: pellet, 40,689 BTU/hr, 81% efficient, 1.0 g/hr smoke
- HP 61: pellet, 39,769 BTU/hr, 80% efficient, 1.2 g/hr smoke
- ComfortBilt HP50S: pellet, 39,170 BTU/hr, 80% efficient, 1.7 g/hr smoke
- HP41 - Alpine: pellet, 32,155 BTU/hr, 80% efficient, 1.6 g/hr smoke
- HP 21: pellet, 31,753 BTU/hr, 76% efficient, 1.5 g/hr smoke
- HP 40: pellet, 26,224 BTU/hr, 81% efficient, 0.74 g/hr smoke
Every US Stove model on the EPA list
- US2500E: wood, 50,470 BTU/hr, 72% efficient, 2.4 g/hr smoke
- US1100E: wood, 39,683 BTU/hr, 66% efficient, 2.4 g/hr smoke
- SP1000E, KP1000E, AP1000E, US1000E: pellet, 39,121 BTU/hr, 75% efficient, 1.0 g/hr smoke
- 5790E: pellet, 36,300 BTU/hr, 75% efficient, 1.0 g/hr smoke
- 5780-E: pellet, 35,041 BTU/hr, 76% efficient, 1.1 g/hr smoke
- US2000 Model Line: wood, 34,130 BTU/hr, 70% efficient, 1.6 g/hr smoke
- Breckwell SP2047: pellet, 33,684 BTU/hr, 75% efficient, 0.41 g/hr smoke
- US1261E, USLW900E: wood, 33,557 BTU/hr, 68% efficient, 1.9 g/hr smoke
- Breckwell Maverick SP22: pellet, 32,788 BTU/hr, 63% efficient, 0.49 g/hr smoke
- KP5522: pellet, 32,591 BTU/hr, 76% efficient, 1.5 g/hr smoke
- Breckwell SP1000, Big E: pellet, 31,935 BTU/hr, 66% efficient, 1.5 g/hr smoke
- KP5517: pellet, 30,884 BTU/hr, 77% efficient, 1.6 g/hr smoke
- 5660: pellet, 29,876 BTU/hr, 75% efficient, 1.7 g/hr smoke
- US1269E, USLW900, CGWS900: wood, 29,234 BTU/hr, 67% efficient, 1.8 g/hr smoke
- US1800E: wood, 28,445 BTU/hr, 73% efficient, 1.8 g/hr smoke
- 5710E: pellet, 28,413 BTU/hr, 83% efficient, 1.6 g/hr smoke
- 5710: pellet, 27,492 BTU/hr, 69% efficient, 1.0 g/hr smoke
- GW1949, AP77, SW1117: pellet, 27,220 BTU/hr, 70% efficient, 0.8 g/hr smoke
- Breckwell and Golden Eagle: pellet, 26,724 BTU/hr, 75% efficient, 1.3 g/hr smoke
- 5780, AP5780, VG5780, SP5780, and SP58: pellet, 26,386 BTU/hr, 72% efficient, 1.3 g/hr smoke
- TH-100: wood, 26,028 BTU/hr, 75% efficient, 1.7 g/hr smoke
- KP5513: pellet, 24,676 BTU/hr, 76% efficient, 1.5 g/hr smoke
- 5770E: pellet, 23,449 BTU/hr, 78% efficient, 1.1 g/hr smoke
- Breckwell SP24E (Blazer), SP24iE (Blazer): pellet, 22,587 BTU/hr, 77% efficient, 0.66 g/hr smoke
- 6041, 6041I, SP6000: pellet, 21,811 BTU/hr, 58% efficient, 1.3 g/hr smoke
- 5770: pellet, 18,619 BTU/hr, 70% efficient, 0.85 g/hr smoke
- 4840: pellet, 12,161 BTU/hr, 72% efficient, 1.4 g/hr smoke
This compares EPA lab results only. It says nothing about price, build quality, warranty or dealer support.
Source: EPA Certified Wood Heater Database, currently certified room heaters, checked Nov 1, 2026.