Comfort Glow KWN521 30,000 BTU Gas Wall Heater — Can It Heat Your Whole Room in 2026?
The Comfort Glow KWN521 delivers 30,000 BTU of gas-powered heat with no electricity needed. It is built for garages and large spaces, not bedrooms or personal use.
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Key Specifications
Best For
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Our Verdict
This is a 30,000 BTU vent-free gas wall heater. It mounts to your wall and heats large spaces without any electricity. It can warm areas up to about 750 sq ft.
The built-in ODS sensor monitors indoor oxygen levels. It shuts the heater off automatically if levels drop too low. Overheat protection adds another layer of safety on top of that.
You get no thermostat with this unit. You control the heat output by hand. Keeping a steady temperature requires your direct attention.
At $246.76, it covers roughly 750 sq ft of space. That works out to about $0.33 per sq ft of coverage. Few heaters at this BTU level cost less.
This heater works best in garages, workshops, and large utility spaces. It also suits cabins or homes without reliable electricity. Bedrooms and small offices are not practical fits for this unit.
What We Like
- Outputs 30,000 BTU per hour, enough to heat up to 750 sq ft
- Runs entirely on gas with no electrical outlet needed
- Built-in ODS sensor automatically shuts off the unit if indoor oxygen drops too low
- Vent-free design requires no ductwork or chimney installation
- Comes backed by a 2-year manufacturer warranty
What Could Be Better
- No thermostat means you cannot set a target temperature automatically
- No tip-over protection listed in the safety feature set
- No timer to schedule heating on or off
- No remote control for adjusting heat from across the room
- Fixed wall-mount means you cannot move it to other rooms
Standout Features
Full Specifications
Additional Info
| Assembly | No |
Frequently Asked Questions
Common questions about WORLD MKTG OF AMERICA/IMPORT KWN521 5 Plaque 30000 BTU Gas Wall Heater,gray, 24.41x28.15x10.25
How much space can this heater warm?
This heater outputs 30,000 BTU per hour. That is enough to heat roughly 750 sq ft of indoor space. It works best in large rooms, garages, or open-plan areas.
Does this heater need to be plugged in?
No. This heater runs on gas and needs no electricity at all. You can use it in spaces without power outlets. It also continues heating during power outages.
Is this heater safe to use indoors?
It includes an ODS sensor that shuts off the unit if indoor oxygen drops too low. It also has overheat protection built in. These two features make it safer for indoor gas heating use.
Does this heater have a thermostat?
No. This heater uses manual controls only. You adjust the heat output by hand yourself. There is no automatic temperature setting or built-in thermostat.
Can I move this heater between rooms?
No. This is a wall-mounted unit that installs in one fixed location. It requires a permanent gas connection to operate. You cannot carry it from room to room.
Best For
How this product scores for different use cases
Scores
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