A strong, efficient pellet insert for anyone who wants real heat from an existing fireplace. Have it installed to the manual and local code.
Amazon $2,499The ComfortBilt HP22i Pellet Insert is the better stove overall, rated 3.5 to 3.3. The ComfortBilt HP22i Pellet Insert leads on efficiency, emissions and warranty. The Comfort Glow CGWI1800 Insert wins on value and convenience. The Comfort Glow CGWI1800 Insert costs $1,200 less ($1,299 vs $2,499).
A good value way to turn an open fireplace into a working heater for up to about 1,200 sq ft, with the blower and faceplate included. Have it installed to the manual and local code.
Amazon $1,299Prices 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 HP22i Pellet Insert for efficiency (81% EPA tested efficiency (HHV) vs 73% EPA tested efficiency (HHV)), emissions (1 g/h of smoke particles (EPA) vs 1.8 g/h of smoke particles (EPA)) and warranty (5-year warranty vs 2-year warranty).
- Choose the Comfort Glow CGWI1800 Insert for value ($45.67 per 1,000 BTU of EPA tested output ($1,299, 28,445 BTU) vs $61.42 per 1,000 BTU of EPA tested output ($2,499, 40,689 BTU)) and convenience (takes 18 in logs, blower included vs up to 18 hours per hopper, thermostat).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every inserts stove; a clear win is highlighted. How we rank explains each one.
| Factor weight | ComfortBilt HP22i Pellet Insert | Comfort Glow CGWI1800 Insert |
|---|---|---|
| Overall rating | 3.5/5 | 3.3/5 |
| Efficiency 30% | 100 81% EPA tested efficiency (HHV) | 65 73% EPA tested efficiency (HHV) |
| Value 30% | 30 $61.42 per 1,000 BTU of EPA tested output ($2,499, 40,689 BTU) | 53 $45.67 per 1,000 BTU of EPA tested output ($1,299, 28,445 BTU) |
| Emissions 15% | 61 1 g/h of smoke particles (EPA) | 29 1.8 g/h of smoke particles (EPA) |
| Warranty 10% | 44 5-year warranty | 11 2-year warranty |
| Convenience 15% | 38 up to 18 hours per hopper, thermostat | 70 takes 18 in logs, blower included |
Specifications
| ComfortBilt HP22i Pellet Insert | Comfort Glow CGWI1800 Insert | |
|---|---|---|
| EPA certification | ||
| EPA certified | Yes (2020 standard) | Yes (2020 standard) |
| Efficiency (HHV) | 81% | 73% |
| Emissions | 1 g/h | 1.8 g/h |
| Tested heat output | 12,820 to 40,689 BTU | 10,689 to 28,445 BTU |
| Heating | ||
| Fuel | Wood pellets | Cord wood |
| Type | Fireplace insert | Fireplace insert |
| Advertised output | 40,689 BTU | - |
| Heats up to | 2,800 sq ft | 1,200 sq ft |
| Catalytic | No | No |
| Blower | Included | Included |
| Thermostat | Yes | No |
| App control | No | No |
| Fuel | ||
| Firebox | - | 1.2 cu ft |
| Longest log | - | 18 in |
| Hopper | 47 lb | - |
| Burn time per hopper | 18 h | - |
| Power needed | 120 V outlet | 120 V outlet |
| Installation | ||
| Flue size | 3 in | - |
| Mobile home approved | Yes | No |
| Safety listing | - | UL |
| Dimensions | - | 44 x 20 x 31 in (W x D x H, with faceplate) |
| Weight | 262 lb | - |
| Warranty | 5 years | 2 years |
| Released | - | 2024-09 |
