Mr. Heater 30K Blue Flame Dual Fuel
#1 in Vent-freeFull review
The pick for heating a big room on either fuel with a thermostat and a long warranty. Add the blower kit for high ceilings.
Amazon $265.39$265.39
The Mr. Heater 30K Blue Flame Dual Fuel is the better gas wall heater overall, rated 4.5 to 4.2. The Mr. Heater 30K Blue Flame Dual Fuel leads on heat output and value. The Mr. Heater 20K Radiant Dual Fuel costs $56.39 less ($209 vs $265.39).
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
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 30K Blue Flame Dual Fuel for heat output (30,000 BTU/hr vs 20,000 BTU/hr) and value ($8.85 per 1,000 BTU ($265.39, 30,000 BTU) vs $10.45 per 1,000 BTU ($209, 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 | Mr. Heater 30K Blue Flame Dual Fuel | Mr. Heater 20K Radiant Dual Fuel |
|---|---|---|
| Overall rating | 4.5/5 | 4.2/5 |
| Value 30% | 73 $8.85 per 1,000 BTU ($265.39, 30,000 BTU) | 61 $10.45 per 1,000 BTU ($209, 20,000 BTU) |
| Heat output 15% | 100 30,000 BTU/hr | 50 20,000 BTU/hr |
| Controls 20% | 75 thermostat, electronic ignition | 75 thermostat, electronic ignition |
| Fuel 5% | 100 runs on propane or natural gas | 100 runs on propane or natural gas |
| Warranty 30% | 100 5-year warranty | 100 5-year warranty |
Specifications
| Mr. Heater 30K Blue Flame Dual Fuel | Mr. Heater 20K Radiant Dual Fuel | |
|---|---|---|
| Heat | ||
| Venting | Vent-free | Vent-free |
| Heat type | Blue flame | Infrared |
| Maximum input | 30,000 BTU/hr | 20,000 BTU/hr |
| Heating area claim | 1,000 sq ft | 700 sq ft |
| Fuel and controls | ||
| Fuel | Dual fuel | Dual fuel |
| Thermostat | Yes | Yes |
| Blower | No | No |
| Ignition | Electronic (battery) | Electronic (battery) |
| Needs an outlet | No | No |
| Oxygen depletion sensor | Yes | Yes |
| Build | ||
| Warranty | 5 years | 5 years |
| Released | 2018-10 | 2018-10 |