ComfortBilt Alpine HP40
#7 in Pellet stovesFull review
A small, clean burning pellet stove for a single room, cabin or small house where a big stove would overheat the space.
Amazon $1,099$1,099
The ComfortBilt Alpine HP40 is the better stove overall, rated 3.8 to 3.0. The ComfortBilt Alpine HP40 leads on value, efficiency and emissions. The ComfortBilt HP21 Pellet Stove wins on warranty. The ComfortBilt Alpine HP40 costs $850 less ($1,099 vs $1,949).
ComfortBilt HP21 Pellet Stove
#25 in Pellet stovesFull review
A traditional looking mid-size pellet stove for a living area, but newer ComfortBilt models burn cleaner and cost less.
ComfortBilt $1,949$1,949
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the ComfortBilt Alpine HP40 for value ($41.91 per 1,000 BTU of EPA tested output ($1,099, 26,224 BTU) vs $61.38 per 1,000 BTU of EPA tested output ($1,949, 31,753 BTU)), efficiency (81% EPA tested efficiency (HHV) vs 76% EPA tested efficiency (HHV)) and emissions (0.7 g/h of smoke particles (EPA) vs 1.5 g/h of smoke particles (EPA)).
- Choose the ComfortBilt HP21 Pellet Stove for warranty (5-year warranty vs 3-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every pellet stoves stove; a clear win is highlighted. How we rank explains each one.
| Factor weight | ComfortBilt Alpine HP40 | ComfortBilt HP21 Pellet Stove |
|---|---|---|
| Overall rating | 3.8/5 | 3.0/5 |
| Efficiency 30% | 100 81% EPA tested efficiency (HHV) | 80 76% EPA tested efficiency (HHV) |
| Value 30% | 41 $41.91 per 1,000 BTU of EPA tested output ($1,099, 26,224 BTU) | 10 $61.38 per 1,000 BTU of EPA tested output ($1,949, 31,753 BTU) |
| Emissions 15% | 78 0.7 g/h of smoke particles (EPA) | 39 1.5 g/h of smoke particles (EPA) |
| Warranty 10% | 22 3-year warranty | 44 5-year warranty |
| Convenience 15% | 55 burn time not published, thermostat | 36 up to 16 hours per hopper, thermostat |
Specifications
| ComfortBilt Alpine HP40 | ComfortBilt HP21 Pellet Stove | |
|---|---|---|
| EPA certification | ||
| EPA certified | Yes (2020 standard) | Yes (2020 standard) |
| Efficiency (HHV) | 81% | 76% |
| Emissions | 0.7 g/h | 1.5 g/h |
| Tested heat output | 13,458 to 26,224 BTU | 12,349 to 31,753 BTU |
| Heating | ||
| Fuel | Wood pellets | Wood pellets |
| Type | Freestanding | Freestanding |
| Advertised output | 26,224 BTU | 32,000 BTU |
| Heats up to | 1,500 sq ft | 2,400 sq ft |
| Catalytic | No | No |
| Blower | Included | Included |
| Thermostat | Yes | Yes |
| App control | No | No |
| Fuel | ||
| Hopper | 25 lb | 40 lb |
| Burn time per hopper | - | 16 h |
| Power needed | 120 V outlet | 120 V outlet |
| Installation | ||
| Flue size | 3 in | - |
| Mobile home approved | Yes | Yes |
| Dimensions | 17 x 18 x 27 in (W x D x H) | 23.5 x 24 x 33 in (W x D x H) |
| Weight | 180 lb | 275 lb |
| Warranty | 3 years | 5 years |
| Released | 2023-02 | - |