Mr. Heater 20K Radiant Dual Fuel
#5 in Vent-freeFull review
A radiant heater for a drafty room, shop or cabin up to about 700 sq ft on either fuel. Radiant heat suits spaces where warm air escapes.
Amazon $209$209
The Mr. Heater 20K Radiant Dual Fuel is the better gas wall heater overall, rated 4.2 to 2.6. The Mr. Heater 20K Radiant Dual Fuel leads on warranty, controls and fuel. The Mr. Heater 20K Radiant Dual Fuel costs $1.69 less ($209 vs $210.69).
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 Mr. Heater 20K Radiant Dual Fuel for warranty (5-year warranty vs 1-year warranty), controls (thermostat, electronic ignition vs electronic ignition) and fuel (runs on propane or natural gas vs natural gas only).
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 | Mr. Heater 20K Radiant Dual Fuel | Dyna-Glo BF20NMDG-4 20K Blue Flame |
|---|---|---|
| Overall rating | 4.2/5 | 2.6/5 |
| Value 30% | 61 $10.45 per 1,000 BTU ($209, 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% | 75 thermostat, electronic ignition | 25 electronic ignition |
| Fuel 5% | 100 runs on propane or natural gas | 0 natural gas only |
| Warranty 30% | 100 5-year warranty | 0 1-year warranty |
Specifications
| Mr. Heater 20K Radiant Dual Fuel | 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 | 700 sq ft | 700 sq ft |
| Fuel and controls | ||
| Fuel | Dual fuel | Natural gas |
| Thermostat | Yes | No |
| Blower | No | No |
| Ignition | Electronic (battery) | Electronic (battery) |
| Needs an outlet | No | No |
| Oxygen depletion sensor | Yes | Yes |
| Build | ||
| Warranty | 5 years | 1 year |
| Released | 2018-10 | - |