A cast iron look pellet stove with app control, for buyers who want a traditional stove and accept below average efficiency.
Amazon $1,749.99
A traditional looking mid-size pellet stove for a living area, but newer ComfortBilt models burn cleaner and cost less.
- 76%Efficiency
- 12,349 to 31,753 BTUHeat output
- 1.5 g/hEmissions
- 5 yearsWarranty
Price checked October 30, 2026. As an Amazon Associate we earn from qualifying purchases.
- Thermostat holds a set temperature between 61 and 82 F
- Up to 16 hours of heat from a 40 lb hopper
- 5 years on the steel body
- Lowest tested efficiency in the ComfortBilt range at 76%
- Pricey for about 31,800 BTU/h of EPA tested output
- Stops heating in a power cut unless you have backup power
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | HP21 |
|---|---|
| EPA certification | |
| EPA certified | Yes (2020 standard) |
| Efficiency (HHV) | 76% |
| Emissions | 1.5 g/h |
| Tested heat output | 12,349 to 31,753 BTU |
| Heating | |
| Fuel | Wood pellets |
| Type | Freestanding |
| Advertised output | 32,000 BTU |
| Heats up to | 2,400 sq ft |
| Catalytic | No |
| Blower | Included |
| Thermostat | Yes |
| App control | No |
| Fuel | |
| Hopper | 40 lb |
| Burn time per hopper | 16 h |
| Power needed | 120 V outlet |
| Installation | |
| Mobile home approved | Yes |
| Dimensions | 23.5 x 24 x 33 in (W x D x H) |
| Weight | 275 lb |
| Warranty | 5 years |
Alternatives in this type
A big hopper pellet stove for buyers who want fewer refills more than top efficiency.
Amazon $1,599.99A premium cast iron pellet stove for buyers who want a traditional look and a wide heat range, and will pay dealer prices for it.
ComfortBilt $4,899Compare
Compare the ComfortBilt HP21 Pellet Stove with any other stove →
More from ComfortBilt: every ComfortBilt product ranked.