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Mr. Heater® Ventless Gas Blue Flame Heater 20,000 - 30,000 BTU

QC Supply Part #: 21044
Shipping: Standard
Availability: In stock
Price From: $199.99 - $242.99

Includes a factory-installed thermostat along with a battery operated electronic ignition.

Please Note:
  • This item can not ship to California or Canada
  • cannot ship via USPS


Operating heater above elevations of 4,500 feet could cause pilot/ODS to shut down heater.

This Ventless, Wall-Mount Blue Flame Heater from Mr. Heater® runs on either propane or natural gas and includes a factory-installed thermostat. The heater has a battery-operated electronic ignition. Available in 20,000 or 30,000 BTU.


  • Ignition System: Electronic manual ignitor, one "AA" battery is required to operate ignitor (no matches or lighter needed)
  • Convenient: Comfort control adjustable thermostat
  • Easy To Install: Wall mount or free standing (no venting or chimney required)
  • Safe: Low oxygen shut-off sensor
  • Operates During Power Outages: without electricity
  • Economical: 99.9% efficiency
  • Blower sold separately
  • 4,500' high altitude restriction

Great For:

  • Rec Rooms
  • Enclosed Porches
  • Room Additions
  • Cabins
  • Workshops
BTU Rating 20,000 20,000 30,000 30,000
Dimensions 19" W x 24" H x 8" D 23.5" W x 24" H x 8" D
Weight 27 lbs 31 lbs
Burn Rate 0.926 lbs/hr 0.020 MCF 1.389 lbs/hr 0.030 MCF
Variable Output No No No No
Heats Up To:
Approx. Sq. Ft
500 500 750 750
Fuel Propane Natural Gas Propane Natural Gas
Min. Recommended
Tank Size
20 lb N/A 20 lb N/A
Certified Yes Yes Yes Yes
Low Oxygen
Shut-Off Switch
Yes Yes Yes Yes
Legs Included Yes Yes Yes Yes
Wall Mount
Hardware Included
Yes Yes Yes Yes
Ignition Electronic Electronic Electronic Electronic
Thermostat Yes Yes Yes Yes
Integrated Blower Fan* No No No No
*Sold Separately
Brand Mr. Heater
Vent Type Non Vented
Application Residential

Manuals & Resources


Customer Reviews

  • 5 Stars

    Well made!, looks Great! and easy to use

    Review by on Jan 7, 2016

    Purchased this unit based on recommendations. I also purchased the blower. Arrived quickly, packaged well to prevent damage. Unit is impressive looking and seems to be built well! I installed in a 10 X 12 warehouse bathroom / utility room. Easy install for wall mounting and connected to main propane source. Works Great! Heats up nice and toasty when using the area... I think the blower is a must... Just cant say enough good about this unit... Had installed for about 2 months and use it frequently....

  • 5 Stars

    Fantastic product

    Review by on Oct 23, 2015

    This is the second one I have purchased for QC. The blue flame heater is everything I imagined. I use them in my garage in the winter when I am working on projects.

  • 5 Stars

    Well Designed

    Review by on Oct 16, 2015

    After some Yankee Ingenuity I really like the Heater.It did not come equipped with a Blower,so the Heat rose directly to the ceiling.I placed a 22 Inch Box Fan on a Bar Stool directly behind the Heater,the Heat is now circulated around the room....What a Genius I am ...LOL

  • 5 Stars

    Well made, looks nice & Not an eye sore in my family room

    Review by on Sep 19, 2015

    The heater is very attractive looking on the wall or free standing. I will be installing soon so I cannot say anything about the performance.I was very impressed with the price from QC Supply, elsewhere the price was much higher.

  • 5 Stars

    I've Been Rescued

    Review by on Dec 27, 2014

    Outstanding in my basement! Additional source of heat helps keep energy bill down! Everything works as advertised. Will be using this for winters to come .

  • 5 Stars

    Love it!

    Review by on Nov 18, 2014

    I had this heater in my previous home in the garage and it worked wonders for cold winter months. I just moved into new home and made sure one was installed in my basement. I did this in case the power goes out so I will have heat and to save my pipes as well. You cannot beat this product, worth every dime!

  • 5 Stars

    Power outage use

    Review by on Sep 26, 2014

    We plan on using when we lose power during the winter snow storms. We did hook it up to our propane tank and lit the heater to see if it would fire and it did right away. We received our email giving us the deliver date and arrived right on time. Very pleased with dealing with this company and if the need arises will order again from them.

  • 5 Stars

    Great Heater

    Review by on Apr 24, 2014

    QC Supply was a lot cheaper than other online stores and Mr Heater is the best. I think the 30,000 btu is a geat buy and it does a great job in my Old Farm House. And QC Employees are great to work with you on what you buy from QC Supply!!!!!

  • 5 Stars

    Keeps Green House Warm

    Review by on Jan 27, 2014

    After searching the Internet, this unit seemed to be the best replacement for my 20 year old furnace that is no longer available. I have to keep the temperature control half way between the pilot setting and "1" so that the green house stays around 50 degrees. The temperature sensor is placed at the bottom back of the unit, and the gravel floor is cold, so the unit never shuts off. I don't know what the inside temperature will be when the outside air warms so that the floor isn't cold.

  • 5 Stars

    Mr. Heater 30,000 BTU Propane

    Review by on Dec 22, 2013

    The heater looks good and works great, we are happy. We bought the same heater 3 years ago, it was $75.00 cheaper but it is worth the extra money to keep us warm.

  • 5 Stars

    Good value, attractive and functional

    Review by on Oct 26, 2013

    Good value. Very nice looking heater. Installation requires some knowledge of plumbing and associated tools. Works as advertised. Plan to use it during extreme cold conditions and during power outage.
    My father in law bought a one like it at a retail store and paid considerably more.

  • 5 Stars

    would recommend to anyone .

    Review by on Oct 1, 2011

    I purchased this heater for my familyroom . My regular heater is real loud we had to turn the volume up an down on the tv when it ran . IT WAS A PAIN . the cold air return always let cold air in because it was on a outside wall ( bad design ) . anyway I am few happy so far with this heater . The weather has not got bad yet . but so far it heats the room up 10 degrees in 30 mins . I also use my ceiling fan because I have a vaulted ceiling . so far love it .

  • 4 Stars

    Great additional source for heating

    Review by on Mar 11, 2010

    The heater is a great additional source of heat, especially when your electric goes out as mine did this past winter. No gas smell and it makes the electric bill cheaper. Product arrived in excellent condition. It replaced an old vent-less unit that had quit working. Would recommend to any one.

  • 4 Stars

    supplement heat

    Review by on Feb 10, 2010

    I use this heater as supplement heat for my uninsulated single car attached garage. The garage has only one small heat/cool register and i've been using an electric space heater out there for years. Without any supplement heat, when it's 20 degrees outside, the garage will be about 57. With an electric space heater the garage will run about 62 degrees (and cost about $2.50 p/day). With the new gas heater, i can keep it as warm as I like . . no problem. The unit has a temp control of between 1 and 5. Through the day when we're gone to work, I keep it on 1 1/2 and when I get home about 2 hours before dark, I turn it up to 2 - 2 1/2. This keeps the garage a comfortable 70 degrees. I seldom run the fan, although I have a ceiling fan bringint the warm air down. These settings work well from -10 degrees to +30 degrees. I can't see ever needing to turn the unit up beyond 3 1/2.

  • 5 Stars

    Apples are better than shoes.

    Review by on Feb 10, 2010

    I am using the heater to heat a 20x20 room and hopefully take the chill of two adjacent bathrooms... we'll see how that works out.

  • 5 Stars

    Wonderful Heater

    Review by on Jan 4, 2010

    I purchased this for backup heat if my power went out but find it useful to just warm my livingroom at night so I can keep the bedrooms cooler. For instant heat it is great. I have used it as my primary heat in the entire home with the fan and additonal ceiling fans it was efficient and warm. The QC sales people were so helpful in providing me with the booklet (online) to view the sources of this product and the warranty information. It was a very positive purchase. QC employees made this buying experience one the the best. I live in Alabama and they shipped it from Nebraska. Wow, I hunted the internet and local hardware stores for a unit that had replaceable parts, this was the only one I found that was NOT a throw away if something went out on it. I highly recommend this product and purchasing from QC Supply. Best regards, LH

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