Mr. Heater 30K Radiant Dual Fuel
#2 in Vent-freeFull review
A big radiant heater for a garage, workshop or open room on either fuel. It pairs thermostat control with the longest warranty in this group.
Amazon $265.39$265.39
4.2/5
A thermostat blue flame heater for a living room or cabin of up to about 700 sq ft that may switch between propane and natural gas. The long warranty sets it apart.
- 20,000 BTU/hrOutput
- Dual fuelFuel
- Blue flameHeat
- YesThermostat
Check price at Amazon$199.99
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Runs on propane or natural gas, so it moves with you if your fuel changes
- Built in thermostat holds the room temperature on its own
- Battery spark ignition lights at the push of a button, and the heater needs no outlet
- The manual backs it with a five year limited warranty, long for a vent-free heater
Cons
- The manual forbids bedroom and bathroom installs
- Blower is a separate purchase
- Ships after a lead time on Amazon
The Mr. Heater Vent-Free Blue Flame family
Every Mr. Heater Vent-Free Blue Flame model we rank, smallest first. Ratings compare each against its own venting.
| Model | Output | Rating | Price |
|---|---|---|---|
| Mr. Heater 20K Blue Flame Dual Fuel (this one) | 20,000 BTU/hr | 4.2/5 | $199.99 |
| Mr. Heater 30K Blue Flame Dual Fuel | 30,000 BTU/hr | 4.5/5 | $265.39 |
How it scores
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.
Specifications
| Model number | MHVFDF20BFT |
|---|---|
| Heat | |
| Venting | Vent-free |
| Heat type | Blue flame |
| Maximum input | 20,000 BTU/hr |
| Heating area claim | 700 sq ft |
| Fuel and controls | |
| Fuel | Dual fuel |
| Thermostat | Yes |
| Blower | No |
| Ignition | Electronic (battery) |
| Needs an outlet | No |
| Oxygen depletion sensor | Yes |
| Build | |
| Warranty | 5 years |
| Released | 2018-10 |
Alternatives in this venting
Heatstar HSSVFBF30LPBT 30K Blue Flame
#3 in Vent-freeFull review
The vent-free heater to buy when you want a blower and thermostat in the box on propane. It costs more up front but needs no add on fan.
Amazon $319.99$319.99
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
Compare
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