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Mr. Heater

Mr. Heater 20,000 BTU Vent Free Blue Flame Propane Heater

Based on 2,763 reviews
Condition: New
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$195.27
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Arrives Saturday, Nov 7
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At a glance

Condition
New
Material
Propane
Model
F299720
Dimensions
11.42"D x 20.28"W x 25.51"H
Weight
19.6 lb
Color
White
Special Feature
Low-Oxygen Safety Shutoff
In the box
Wall mounting hardware included
Warranty
1 year limited.

Features 10

  • 20,000 BTU/HR
  • Heats up to 700 sq. ft.
  • Battery operated electronic ignition - requires one AAA battery (included)
  • No Electricity Required

Description

This Blue Flame 20,000 BTU Liquid Propane Vent Free heater is the perfect supplemental heating solution even on the coldest days. This heater is conveniently equipped with a thermostat for superior control of the temperature in your space. Also, with a battery powered electronic ignition, starting it is a breeze - battery included. This unit can be permanently mounted to the wall with included mounting brackets. Feet for floor mounting are not included. A clean burning blue flame tube burner uses the natural convection of the burn to circulate warm comfortable air. With a factory standard Oxygen Depletion Sensor (ODS), rest assured this heater will provide you with years of comfortable and safe heat.

Specs 28

Brand Mr. Heater
Special Feature Low-Oxygen Safety Shutoff
Color White
Form Factor Cabinet
Indoor/Outdoor Usage Indoor
Special Features Low-Oxygen Safety Shutoff
Indoor Outdoor Usage Indoor
Power Source Propane

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Nov 7

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Top Amazon Reviews

Why I love this heater
Style: installed
1. Do not underestimate the importance of having a thermostat on a heater. I am a mr. Heater fan and have the big buddy and little buddy but you have to be right there to turn it down if it gets too warm. Having the thermostat is great and saves on fuel because it shuts off when it's warm enough. There is a very nice feature no matter where the thermostat is set that when it approaches the turn off temperature the flame will reduce to about half so I assume it goes from 20000 to 10000 BTU which is going to save fuel. I do not like the range of the thermostat. I have never used it above 1 and heat a 36-foot travel trailer in 30 degree weather. Although it may not be recommended you can tweak the thermostat between pilot and number one and get a range out of it where it will still cycle in the temperature range around 55 to 60. 2. Believe what other people say about the 90 degree adapter that comes with it. I thought well they just don't know how to thread it carefully and I do. I carefully screwed it on barely fingertight and tried to unscrew it and it wouldn't budge. Let me emphasize don't even try it. I ended up not needing one anyway. 3. This has a nice window to look at the nice blue flame. This type of heaters job is to heat the air and it does that great except the Heat and the air goes straight up. If you expect to sit in front of it and feel the nice warmth you will be disappointed. What you will feel is the cool air on the floor returning to the heater to be heated and thrust upward. If you want the radiant direct feel of the warmth soaking into your clothing and feeling cozy you need a heater like the mr. Buddy. 5. Pay attention to the measurements. The photos gave me the impression that the unit was much smaller. 6. I do not notice a bad propane smell. I'm sure there's some but it doesn't bother me. I feel good that I'm getting a hundred percent efficiency versus a vented furnace such as the one installed in the trailer where so much of the heat goes out the vent on the side. I am not at all concerned about leaving it on while I sleep unlike most people. Remember these units only produce water and carbon dioxide the same thing you exhale from your lungs. Unless there is an incomplete burning issue you will not get carbon monoxide the poisonous gas. I also feel like I can trust the oxygen sensor to turn off the unit before a lack of oxygen turns me off, again I'm probably unique in my opinions. For the water buildup on the windows I use a sponge and a squeegee and then ring out the sponge and have the water go down the drain. I had this lame brainstorm idea that I would use a Shop-Vac to suck off the moisture and yes it did work but the sponge and squeegee method is much easier. 7. Pet Friendly.. When I used the Buddy radiatant heater I had to worry about their fur touching hot surface and have singed tales, BUT this heater is actually cool all around because all the heat goes straight up to heat the room. ... show more
Reviewed in the United States on November 3, 2018 by Milt Green
Works well if you can afford to feed it.
Style: installed
I'm absolutely thrilled with this heater. It is, and can be a literal lifesaver. Bought this to put in a 40ft motorhome for a back up.... Just in case of a power outage..... The afternoon I installed it, temps dropped to 11° below zero and stayed that way for a week. As anticipated, power went out 4 hours after I installed it . I couldn't believe it. This heater ALONE kept my place 70° without a hiccup, in -11° weather and I never got past the minimal setting. (#1 out of 5)! I've had it for 9 days, it works perfectly, thermostat works perfectly, off and on again by itself, without me having to leave my comfort zone. No noise, ( I expected some cracking sounds as the metal expanded and contracted) as it warmed and cooled. Nope, totally quiet. For my money.... It is an incredible value. The design is total simplicity, if it's not operating correctly, the fix can't be too complicated. It got the real test the very first night, and totally exceeded any expectations I had. UPDATE: 11 Days after installation, heater emptied a 100 pound propane tank, ($75 worth). I had high hopes this would be a cost effective alternative to heating with electricity. For me.... It is not. Even though it got me through a week of sub zero weather, including two power outages, and never needing to turn the thermostat past #1, it went through propane like it was water. I was hopeful that a 100 lb tank would last a month. At this rate of consumption, a month of use, on the lowest possible setting, would cost me $220. That, in addition to my electric bill, just doesn't pencil out to be feasible for use as a soul heating appliance. However.... In an emergency, power outage type situation..... It could be a lifesaver. IF............ You have a substantial amount of propane on hand. One's not much good without the other. ... show more
Reviewed in the United States on January 19, 2024 by Skip
Awesome In Every Way. Update...
Style: installed
I purchased a 30,000 BTU heater a few months back and love it. For the master bedroom & bath I've been using electric heaters. After still freezing in the back half of the house and a $600 power bill, I decided to buy another propane heater. In such a small area I certainly didn't need 20,000 BTUs but this was the smallest I could find with an actual thermostat. The thermostat works great! The range is marked 0-5 not in degrees. But they are very accurate. #2 setting keeps it at a toasty 74 degrees when it's below freezing outside. Being so large, it only runs for less than a minute cycling on & off as needed. I expect it will pay for itself the first month. It can set on the floor with the included feet or be wall mounted with the included bracket. It's a bit modern looking for my taste but the blue flame and performance more than makes up for that minor flaw. To connect it to a gas supply, you will need some brass fittings / hardware, a hose & regulator unless connected to your main supply. Every component is available on Amazon or your local hardware store. Don't forget teflon tape for the threaded pipe joints! Maintenance is quick & easy. Basically cleaning the pilot orfice of dust that may accumulate. The manual says every three months. My house apparently lacks any insulation and resembles a wind tunnel. (I bought it over the phone, without seeing it first lol. Initially I didn't care, I bought it for the land & planned on building a new house anyway. I just never imagined it could be this bad.) I'm in awe these two heaters can keep up but they do, and quite well! They are comparatively economical to operate too. Hopefully our new house will be finished before next winter. And yes, I'm transferring these heaters to the new place! If it turns out they aren't needed, I can put them in the stable to keep my horses warm. I would absolutely buy them again and highly recommend them! To clarify, the larger heater (30,000 BTU) in the living room would heat the entire house but the back is generally closed off. That's why I needed the smaller 20,000 BTU unit. FYI the thermostat in the living room is set about 2 1/4 to maintain 74 degrees. Obviously you can adjust the temperature to your liking. I prefer HOT. Shipping was fast and very well packed. UPS proof. After using them I suspect they would perform equally well in a workshop / garage where open flame wouldn't be an issue. Buy this, you will be VERY happy with it. Update... After complete satisfaction with the first two, I just bought a third for my workshop. This time Amazon suggested a hose & regulator kit which I gladly bought with it. It's somewhat of a pain in the rump to find the right hose & fittings each time. This made it really easy. Everything was included but a tank (which I already have). I think it's actually less expensive in kit form as well. I might buy #4 for the barn to spoil my horses. 😉 ... show more
Reviewed in the United States on January 11, 2023 by Jeff P
Good heater
Style: installed
This heater works quite well. One issue for our situation is that we wanted to use it to heat a garden shed with many windows that we use as a large coldframe in the spring, so we only need to heat it to around 45-50, whereas the heater will heat to around 60 at its lowest setting, using a lot more gas. Based on a suggestion from one technician, I removed the heat sensor from the back and moved it close to the front of the unit on the inside, in order to trick the heater into thinking the air was warmer than it really was. This did help a good deal. Some have noted incomplete burning and therefore an odor when it's run for a long time at the lowest setting. I think we had that once too. If you're using this with a standard small tank attached by a hose, when you first attach a new tank, leave it connected for at least a half hour (or even an hour) before doing anything and, after that, hold down the dial in Pilot position for at least as long as they suggest (30 second or more) before you try to start. Once it catches and has burned for a while, it's easy to start again. Keep in mind that you need a regulator (not supplied with the unit.) ... show more
Reviewed in the United States on April 26, 2019 by F. Curtis
Does exactly what I need it to do
Style: installed
Purchased as an emergency heat source. I've owned it for 2-1/2 years and used it 3 times most recently for about 4 days. The first time I used it was for about 24 hours when it was 38 below and my fancy high-efficiency furnace had pressure switch problems and wouldn't run. This 20k btu heater on its highest setting kept ~750 sq feet of my (not very well insulated) home pretty much comfortable but did use about a pound of propane per hour which makes sense because propane is ~21k btu per pound and this is rated to use 20k btu per hour on high. Kept us warm enough and kept the pipes from freezing until I could obtain a pressure switch for the furnace. That use case was exactly what I worried about enough to buy a back up heater. It performed admirably. Last week in temps ranging from 22 degrees at night to 38 degrees during the daytime and 20-40 mph winds sucking the heat out of my place, I ran it for just a bit less than 4 days during a power outage. I never turned it up past the #3 setting and the thermostat switched the heat on and off as expected. After ~4 days, there was still at maybe 8-10 lbs of propane left in the 30lb tank it was hooked to. I think I could have gone at least another full day without having to swap tanks. I use the included feet and don't have it permanently mounted to the wall. It's perfectly stable. I run the regulator hose to a tank outside through a casement window and just run a strip of duct tape to seal the rest of the window. And, while I do have an CO & combustible gas detector in the area where I operate this, I don't actually worry about it. So long as the flame is almost entirely blue and it isn't sputtering, then everything is working right and there's nothing to fret about. When I bought this, I understood that I needed a hose, regulator, and a 90 degree fitting. Many of the negative reviews regard folks not knowing that. I suppose in today's world where we expect instant gratification and hope to put forth zero effort, it's hard to blame them for being upset. It wasn't any sort of problem for me, though. Other complaints seem to be about noises and odor. 1) Noises. I haven't really noticed any noises that are bothersome. There's a tick when the thermostat regulates the gas up/down/on/off, but that's what mechanical thermostats do. No problem for me. 2) Odors. Yes. Burning propane indoors unvented creates a bit of an odor. It's no worse than operating a propane oven/stove. I don't find it to be overwhelmingly offensive, so no problem for me on that point, either. I will say that 2 days in to this latest use, I did choose to open a couple of windows on each side of the house for about 15 minutes once. That served to remove the odor for a while and decrease the humidity a little. ... show more
Reviewed in the United States on May 10, 2024 by six
lot cheaper then Kerosene
Style: installed
got rid of the old Kerosene heater with this and LOVE IT.....no smell, half the cost and NO VENTING NEEDED!!....the reduction in fuel costs over the first season already paid for itself....5 gallons of KO is costing me 35 dollars.....a single 20 pound propane bottle costs me 15 dollars to refill and on average has given me about 24 hours of more burn time then 5 gallons of KO did......this has a lot to do with the thermostat as the kerosene heater was always on or off with freezing in between or burning up after a hour after lighting it..... DOWNSIDES......the thermostat is always burning in the pilot light....in the first year of use the tip has burned down and will need to replaced.....burning is also showing rust where the pilot light always burns....I give it 2 years before i have to replace the thermostat and maybe 2 to 4 years on the burner needing to be replaced.....BUT I WONT CARE as i will have a ton of cash to fix it after not buying kerosene at 7 dollars a gallon in my area for a couple of years!!!.....you really need a real thermostat in the room its used in to dial in the gauge on the unit as its never the same.....try to warm up a 40 degree house and you will set it to 3 or 4 on the gauge to get to 68f.....try to get the same house to 68f from 60f and you may need to set it to 2 on the gauge.....set it to high when everything is cold and it howls like a banchie!!! even with the downsides I am saving a LOT OF MONEY on fuel costs....replacing it every 4 years would be cheaper then burning Kerosene.....but the build quality of this unit I will be replacing a simple burner or pilot light....no biggy..... ... show more
Reviewed in the United States on March 28, 2024 by Tannis
Poor Quality of Materials - Doesn't Provide a Sense of "Safety"
Style: installed
This was a cheaply manufactured piece of junk that I returned right away after unboxing and seeing how flimsy all the materials were on this item. An item like this needs to have well built and assembled components to prevent accidents and fires. Can't say I felt comfortable at all to leave this running in the home. This device felt like it cost the manufacturer about 10 dollars to make this item overseas and then sell it for 10x-15x profits in the United States. Very poor quality and design and it shows. ... show more
Reviewed in the United States on September 5, 2026 by ElectricianTech353
Heater produced enough heat to keep me very comfortable during my stay
Style: installed
5.0 out of 5 stars It really works well in COLD conditions! By Ed M. Courtney, Jr. on December 29, 2017 I purchased the Mr. Heater 20,000 BTU heater for my toy hauler in September and installed it in the toy storage area after the summer camping season was over. I then had a camping opportunity in December in the Owyhee Mountains in southern Idaho. The camp elevation was at 4770 feet. When I arrived at camp, snow was on the ground and the temperature was 23 degrees F. I immediately fired up the heater and turned it to the highest setting, By bedtime the forward sleeping area was up to 62 degrees and it was in the single digits outside. Before daylight it was -4 degrees out side and the inside sleeping area was 60 degrees. It was about 5 degrees warmer in the large toy compartment with the heater. It warmed up some after several days and the lows were in the teens for the rest of my three week stay. It also snowed seven or eight inches during this period. After the initial warm up of my toy hauler, I was able to adjust the heater level to lower levels. The heater routinely kept the temperature in the forward sleeping compartment about 5 degrees cooler than in the large toy storage area. Being paranoid, I cracked a window on each side of the trailer about 1/2". I also had a propane detector and two smoke/ monoxide detectors. None of them ever alerted and the heater never shut down from oxygen depletion. The heater produces a steady heat until it reaches whatever level you select. It will probably vary on how well your RV/cabin is insulated. RVs are not very well insulated, especially the windows, but Mr. Heater produced enough heat to keep me very comfortable during my stay. It is really nice not to have to rely on battery power from the RV as there wasn't much sun to keep my solar powered batteries up if I had had to rely on the RVfurnace. It was a great test for the heater and it passed with flying colors. It does use a lot of propane in what I consider extreme camping conditions. I couldn't have stayed at the camp without Mr. Heater performing well. ... show more
Reviewed in the United States on December 30, 2017 by Ed M. Courtney, Jr.
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