A plain manual blue flame heater for a natural gas living room or den. Most buyers will get more for the money from a thermostat model.
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Every Dyna-Glo Blue Flame Manual model we rank, smallest first. Ratings compare each against its own venting.
| Model | Output | Rating | Price |
|---|---|---|---|
| Dyna-Glo BF10NMDG-4 10K Blue Flame | 10,000 BTU/hr | 1.9/5 | $175.86 |
| Dyna-Glo BF20NMDG-4 20K Blue Flame (this one) | 20,000 BTU/hr | 2.6/5 | $210.69 |
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its venting. How we rank explains each one.
| Model number | BF20NMDG-4 |
|---|---|
| Heat | |
| Venting | Vent-free |
| Heat type | Blue flame |
| Maximum input | 20,000 BTU/hr |
| Minimum input | 10,000 BTU/hr |
| Heating area claim | 700 sq ft |
| Fuel and controls | |
| Fuel | Natural gas |
| Thermostat | No |
| Blower | No |
| Ignition | Electronic (battery) |
| Needs an outlet | No |
| Oxygen depletion sensor | Yes |
| Build | |
| Warranty | 1 year |
A propane infrared heater for a garage, workshop or large drafty room where radiant heat beats warm air. Its wide turn down makes it flexible, but you set the heat by hand.
Amazon $234.05A low cost thermostat heater for a propane home, cabin or shop up to a mid size room. It stays useful when the power is out.
Amazon $170.99A cheap thermostat controlled heater for one small natural gas room or office. Buy it when you want hands-off warmth and do not need much output.
Amazon $129.59Compare the Dyna-Glo BF20NMDG-4 20K Blue Flame with any other gas wall heater →
More from Dyna-Glo: every Dyna-Glo product ranked.
