Comfort Glow CGWS2500
#16 in Wood stovesFull review
A large, reasonably efficient stove for heating a whole small house or big shop on long firewood. Have it installed to the manual and local code.
Amazon $1,149$1,149
3.3/5
For a small to mid size home that wants long, clean catalytic burns and soapstone’s gentle heat in a compact stove.
- 79%Efficiency
- 14,000 to 24,000 BTUHeat output
- 1.1 g/hEmissions
- Limited lifetimeWarranty
Check price at Leisure Time$3,349Check price at Lehman's$3,499
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Soapstone lined steel body keeps giving off heat long after the fire dies down
- 79% efficient catalytic hybrid stretches a load up to 16 hours
- Compact enough for a smaller room yet heats up to 1,400 sq ft
Cons
- Takes only 16 in logs, so you cut wood shorter
- Neither store listing it takes an online order; Lehman’s shows it out of stock
The Hearthstone Green Mountain family
Every Hearthstone Green Mountain model we rank, smallest first. Ratings compare each against its own type.
| Model | Efficiency | Rating | Price |
|---|---|---|---|
| Hearthstone Green Mountain 40 (this one) | 79% | 3.3/5 | $3,349 |
| Hearthstone Green Mountain 60 | 79% | 3.6/5 | $3,749 |
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 | 8640 |
|---|---|
| EPA certification | |
| EPA certified | Yes (2020 standard) |
| Efficiency (HHV) | 79% |
| Emissions | 1.1 g/h |
| Tested heat output | 14,000 to 24,000 BTU |
| Heating | |
| Fuel | Cord wood |
| Type | Freestanding |
| Advertised output | 40,000 BTU |
| Heats up to | 1,400 sq ft |
| Catalytic | Yes |
| Blower | Optional |
| Thermostat | No |
| App control | No |
| Fuel | |
| Firebox | 1.3 cu ft |
| Longest log | 16 in |
| Power needed | None |
| Installation | |
| Flue size | 6 in |
| Mobile home approved | Yes |
| Safety listing | PFS |
| Dimensions | 23.25 x 19.375 x 30.375 in (W x D x H) |
| Weight | 350 lb |
| Warranty | Limited lifetime |
Alternatives in this type
Hearthstone Castleton
#17 in Wood stovesFull review
For a small to mid size home that wants a classic cast iron and soapstone look with clean, long catalytic burns.
Leisure Time $3,899 Lehman's $4,049$3,899
Drolet Escape 1800
#19 in Wood stovesFull review
A good value wood stove for mid size homes up to about 2,100 sq ft from a long running Canadian maker.
Drolet $1,549$1,549
Compare
Compare the Hearthstone Green Mountain 40 with any other stove →
More from Hearthstone: every Hearthstone product ranked.