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
4.2/5
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.
- 20,000 BTU/hrOutput
- Dual fuelFuel
- InfraredHeat
- YesThermostat
Check price at Amazon$209
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Radiant plaques warm people and surfaces directly, so it feels warm quickly in a drafty room
- Propane or natural gas from one heater
- Thermostat and battery spark ignition, with no outlet needed
- Five year limited warranty in the manual
Cons
- On propane it drops to 18,000 BTU
- Hot plaque face needs distance from children, pets and furniture
- Blower sold separately
The Mr. Heater Vent-Free Radiant family
Every Mr. Heater Vent-Free Radiant model we rank, smallest first. Ratings compare each against its own venting.
| Model | Output | Rating | Price |
|---|---|---|---|
| Mr. Heater 20K Radiant Dual Fuel (this one) | 20,000 BTU/hr | 4.2/5 | $209 |
| Mr. Heater 30K Radiant 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 | MHVFDF20RTT |
|---|---|
| Heat | |
| Venting | Vent-free |
| Heat type | Infrared |
| 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
Mr. Heater 20K Blue Flame Dual Fuel
#4 in Vent-freeFull review
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.
Amazon $199.99$199.99
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
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