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
The Heatstar HSSVFBF30LPBT 30K Blue Flame is the better gas wall heater overall, rated 4.4 to 3.4. The Heatstar HSSVFBF30LPBT 30K Blue Flame leads on warranty and controls. The Comfort Glow KWN523 30K Infrared wins on value. The Comfort Glow KWN523 30K Infrared costs $62.32 less ($257.67 vs $319.99).
Comfort Glow KWN523 30K Infrared
#7 in Vent-freeFull review
A thermostat infrared heater for a large natural gas room, basement or garage. It offers a longer warranty than most budget rivals.
Amazon $257.67$257.67
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 HSSVFBF30LPBT 30K Blue Flame for warranty (5-year warranty vs 2-year warranty) and controls (thermostat, blower, electronic ignition vs thermostat).
- Choose the Comfort Glow KWN523 30K Infrared for value ($8.59 per 1,000 BTU ($257.67, 30,000 BTU) vs $10.67 per 1,000 BTU ($319.99, 30,000 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 HSSVFBF30LPBT 30K Blue Flame | Comfort Glow KWN523 30K Infrared |
|---|---|---|
| Overall rating | 4.4/5 | 3.4/5 |
| Value 30% | 60 $10.67 per 1,000 BTU ($319.99, 30,000 BTU) | 75 $8.59 per 1,000 BTU ($257.67, 30,000 BTU) |
| Heat output 15% | 100 30,000 BTU/hr | 100 30,000 BTU/hr |
| Controls 20% | 100 thermostat, blower, electronic ignition | 50 thermostat |
| Fuel 5% | 0 propane only | 0 natural gas only |
| Warranty 30% | 100 5-year warranty | 25 2-year warranty |
Specifications
| Heatstar HSSVFBF30LPBT 30K Blue Flame | Comfort Glow KWN523 30K Infrared | |
|---|---|---|
| Heat | ||
| Venting | Vent-free | Vent-free |
| Heat type | Blue flame | Infrared |
| Maximum input | 30,000 BTU/hr | 30,000 BTU/hr |
| Heating area claim | 750 sq ft | 1,000 sq ft |
| Fuel and controls | ||
| Fuel | Propane | Natural gas |
| Thermostat | Yes | Yes |
| Blower | Yes | No |
| Ignition | Electronic (battery) | Push button |
| Needs an outlet | No | No |
| Oxygen depletion sensor | Yes | Yes |
| Build | ||
| Weight | 30 lb | - |
| Warranty | 5 years | 2 years |
| Released | - | 2016-07 |