Heatstar HSSVFRD20NGBT 20K Radiant
#6 in Vent-freeFull review
A natural gas radiant heater for a mid size room or workshop that comes complete with blower and thermostat. Pay the premium if you would otherwise buy a fan kit.
Amazon $259.99$259.99
The Heatstar HSSVFRD20NGBT 20K Radiant is the better gas wall heater overall, rated 4.0 to 2.6. The Heatstar HSSVFRD20NGBT 20K Radiant leads on warranty and controls. The Dyna-Glo BF20NMDG-4 20K Blue Flame wins on value. The Dyna-Glo BF20NMDG-4 20K Blue Flame costs $49.30 less ($210.69 vs $259.99).
Dyna-Glo BF20NMDG-4 20K Blue Flame
#13 in Vent-freeFull review
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.
Amazon $210.69$210.69
Prices were last checked November 2, 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 Heatstar HSSVFRD20NGBT 20K Radiant for warranty (5-year warranty vs 1-year warranty) and controls (thermostat, blower, electronic ignition vs electronic ignition).
- Choose the Dyna-Glo BF20NMDG-4 20K Blue Flame for value ($10.53 per 1,000 BTU ($210.69, 20,000 BTU) vs $13 per 1,000 BTU ($259.99, 20,000 BTU)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every vent-free gas wall heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Heatstar HSSVFRD20NGBT 20K Radiant | Dyna-Glo BF20NMDG-4 20K Blue Flame |
|---|---|---|
| Overall rating | 4.0/5 | 2.6/5 |
| Value 30% | 46 $13 per 1,000 BTU ($259.99, 20,000 BTU) | 61 $10.53 per 1,000 BTU ($210.69, 20,000 BTU) |
| Heat output 15% | 50 20,000 BTU/hr | 50 20,000 BTU/hr |
| Controls 20% | 100 thermostat, blower, electronic ignition | 25 electronic ignition |
| Fuel 5% | 0 natural gas only | 0 natural gas only |
| Warranty 30% | 100 5-year warranty | 0 1-year warranty |
Specifications
| Heatstar HSSVFRD20NGBT 20K Radiant | Dyna-Glo BF20NMDG-4 20K Blue Flame | |
|---|---|---|
| Heat | ||
| Venting | Vent-free | Vent-free |
| Heat type | Infrared | Blue flame |
| Maximum input | 20,000 BTU/hr | 20,000 BTU/hr |
| Minimum input | - | 10,000 BTU/hr |
| Heating area claim | 500 sq ft | 700 sq ft |
| Fuel and controls | ||
| Fuel | Natural gas | Natural gas |
| Thermostat | Yes | No |
| Blower | Yes | No |
| Ignition | Electronic (battery) | Electronic (battery) |
| Needs an outlet | No | No |
| Oxygen depletion sensor | Yes | Yes |
| Build | ||
| Weight | 27 lb | - |
| Warranty | 5 years | 1 year |