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 3.4. The ComfortBilt Alpine HP40 leads on value, efficiency and emissions. The ComfortBilt Alpine HP40 costs $200.99 less ($1,099 vs $1,299.99).
Castle Serenity 41278
#19 in Pellet stovesFull review
A simple, easy to clean pellet stove with good scheduling for a small home, held back by a short warranty.
Amazon $1,349 Castle $1,299.99$1,299.99
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 $49.07 per 1,000 BTU of EPA tested output ($1,299.99, 26,493 BTU)), efficiency (81% EPA tested efficiency (HHV) vs 78% EPA tested efficiency (HHV)) and emissions (0.7 g/h of smoke particles (EPA) vs 1 g/h of smoke particles (EPA)).
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 | Castle Serenity 41278 |
|---|---|---|
| Overall rating | 3.8/5 | 3.4/5 |
| Efficiency 30% | 100 81% EPA tested efficiency (HHV) | 90 78% EPA tested efficiency (HHV) |
| Value 30% | 41 $41.91 per 1,000 BTU of EPA tested output ($1,099, 26,224 BTU) | 28 $49.07 per 1,000 BTU of EPA tested output ($1,299.99, 26,493 BTU) |
| Emissions 15% | 78 0.7 g/h of smoke particles (EPA) | 61 1 g/h of smoke particles (EPA) |
| Warranty 10% | 22 3-year warranty | 0 1-year warranty |
| Convenience 15% | 55 burn time not published, thermostat | 55 burn time not published, thermostat |
Specifications
| ComfortBilt Alpine HP40 | Castle Serenity 41278 | |
|---|---|---|
| EPA certification | ||
| EPA certified | Yes (2020 standard) | Yes (2020 standard) |
| Efficiency (HHV) | 81% | 78% |
| Emissions | 0.7 g/h | 1 g/h |
| Tested heat output | 13,458 to 26,224 BTU | 12,807 to 26,493 BTU |
| Heating | ||
| Fuel | Wood pellets | Wood pellets |
| Type | Freestanding | Freestanding |
| Advertised output | 26,224 BTU | 31,960 BTU |
| Heats up to | 1,500 sq ft | 1,500 sq ft |
| Catalytic | No | No |
| Blower | Included | Included |
| Thermostat | Yes | Yes |
| App control | No | No |
| Fuel | ||
| Hopper | 25 lb | 40 lb |
| Power needed | 120 V outlet | 120 V outlet |
| Installation | ||
| Flue size | 3 in | 3 in |
| Mobile home approved | Yes | Yes |
| Dimensions | 17 x 18 x 27 in (W x D x H) | 18.25 x 23.75 x 34 in (W x D x H) |
| Weight | 180 lb | 186 lb |
| Warranty | 3 years | 1 year |
| Released | 2023-02 | 2023-08 |