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Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater

Q: Does anyone know or understand how is it this type of propane heater can be used indoors without causing carbon dioxide poisoning?

asked on April 17, 2015

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FYI Carbon Monoxide is the dangerous gas, not carbon dioxide. That's CO, not CO2. We breathe a ton of CO2 everyday. Burning propane releases carbon dioxide UNLESS there's not enough oxygen in the air to create a CO2 molecule, in which case only a toxic CO molecule is created during combustion. This heater, you'll note,… see more FYI Carbon Monoxide is the dangerous gas, not carbon dioxide. That's CO, not CO2. We breathe a ton of CO2 everyday. Burning propane releases carbon dioxide UNLESS there's not enough oxygen in the air to create a CO2 molecule, in which case only a toxic CO molecule is created during combustion. This heater, you'll note, has a low oxygen sensor that shuts it off automatically. This is a safety feature to keep carbon monoxide from being produced as a result of too little oxygen in the air. Therefore this should theoretically be safe indoors and will not produce carbon monoxide. But personally, I'd err on the safe side and buy a cheap carbon monoxide detector as a backup safety. see less FYI Carbon Monoxide is the dangerous gas, not carbon dioxide. That's CO, not CO2. We breathe a ton of CO2 everyday. Burning propane releases carbon dioxide UNLESS there's not enough oxygen in the air to create a CO2 molecule, in which case only a toxic CO molecule is created during combustion. This heater, you'll note, has a low oxygen sensor that shuts it off automatically. This is a safety feature to keep carbon monoxide from being produced as a result of too little oxygen in the air. Therefore this should theoretically be safe indoors and will not produce carbon monoxide. But personally, I'd err on the safe side and buy a cheap carbon monoxide detector as a backup safety. Matt Turner · March 26, 2016 423 people found this helpful. Do you? Yes | Report Biochemist here... In addition to the correct responses regarding incomplete reaction being due to a general oxygen deficiency, there are more causes. Practically speaking, incomplete combustion resulting in CO production can also be caused by: 1) the combustion reaction occurring at a temperature less than the idea… see more Biochemist here... In addition to the correct responses regarding incomplete reaction being due to a general oxygen deficiency, there are more causes. Practically speaking, incomplete combustion resulting in CO production can also be caused by: 1) the combustion reaction occurring at a temperature less than the ideal temperature, 2) excess hydrocarbon (i.e. fuel) in the reaction, and 3) if the reactants do not have enough time to diffuse thoroughly in the reaction chamber before being exhausted from the reaction chamber. Use caution. Get a sensitive CO detector with an alarm, and place it carefully because CO can build up concentration in low spaces if the rate of CO production is greater than the rate of CO diffusion in the air. see less Biochemist here... In addition to the correct responses regarding incomplete reaction being due to a general oxygen deficiency, there are more causes. Practically speaking, incomplete combustion resulting in CO production can also be caused by: 1) the combustion reaction occurring at a temperature less than the ideal temperature, 2) excess hydrocarbon (i.e. fuel) in the reaction, and 3) if the reactants do not have enough time to diffuse thoroughly in the reaction chamber before being exhausted from the reaction chamber. Use caution. Get a sensitive CO detector with an alarm, and place it carefully because CO can build up concentration in low spaces if the rate of CO production is greater than the rate of CO diffusion in the air. spool · November 1, 2019 174 people found this helpful. Do you? | Report To correct another answer above, 9-15ppm is NOT considered an occupational risk. Those are extremely low levels. Max for occupational risk is 50ppm (over 8 hours) and some states have regulated down to 35ppm, but there is no current scientific evidence that 35ppm causes any long term issues. So if you're measuring 10-15ppm with this heater on, you should be fine. As always, keep a CO monitor around in case something changes - equipment can change with time and result in worse combustion. John Lottgieb · November 9, 2020 98 people found this helpful. Do you? | Report As soon as the weather gets cold, I put my Big Buddy Heater on a stand & use a Mr. Heater 12' hose with regulator running to a 20lb. tank in living room. I use the hose with the low pressure regulator on it & hook it up to the quick connect fitting. I have 2 20lb tanks in mint condition, and rotate them as needed. T… see more As soon as the weather gets cold, I put my Big Buddy Heater on a stand & use a Mr. Heater 12' hose with regulator running to a 20lb. tank in living room. I use the hose with the low pressure regulator on it & hook it up to the quick connect fitting. I have 2 20lb tanks in mint condition, and rotate them as needed. This will be my 7th winter using it. Old windows & doors let air in and I have a carbon monoxide alarm near by. Also use a leak detector to check all connections after hooking up a full tank. If it's really cold, I'll start it on high for a short time, then run it on medium & it keeps living & dining room warm. Cuts my oil bill down greatly. see less As soon as the weather gets cold, I put my Big Buddy Heater on a stand & use a Mr. Heater 12' hose with regulator running to a 20lb. tank in living room. I use the hose with the low pressure regulator on it & hook it up to the quick connect fitting. I have 2 20lb tanks in mint condition, and rotate them as needed. This will be my 7th winter using it. Old windows & doors let air in and I have a carbon monoxide alarm near by. Also use a leak detector to check all connections after hooking up a full tank. If it's really cold, I'll start it on high for a short time, then run it on medium & it keeps living & dining room warm. Cuts my oil bill down greatly. Altair · December 15, 2020 200 people found this helpful. Do you? | Report This heater has an oxygen sensor built in. It will shut down automatically. I know first hand. I used one in my tent trailer. It was warm and comfy until about 2 am. I woke up because it was cold and found heater out. I relit it and it worked for about 30 min. Went out again. Did that all night. Once I opened door it worked properly. I called mfg service tech. He said it worked perfectly. It will shut down before you would know anything is wrong. Great heater! Just open a window next to the heater to give it air. Mugs N Coffee Seller · April 17, 2015 50 people found this helpful. Do you? | Report I would be VERY CAREFUL! I have a small 12 foot travel trailer. This heater seemed like the prefect solution to warm it up quickly and then switch over to the electric heat. I work for a small fire department part time so I have access to our co detector. I started up the heater, opened a window near it 3 inches so t… see more I would be VERY CAREFUL! I have a small 12 foot travel trailer. This heater seemed like the prefect solution to warm it up quickly and then switch over to the electric heat. I work for a small fire department part time so I have access to our co detector. I started up the heater, opened a window near it 3 inches so there was an open space of 3 inches by 18 inches. The heater worked wonderfully to heat the space. But quickly the co climbed and hovered at between 10 and 15 ppm. Not high enough trigger a normal house co detector, but enough to be a health risk. Limit on occupational exposure to co is 9ppm over an 8 hour period. At 10 to 15 limit should be a couple hours. Thebtilenis burning orange and every indication is the brand new heater is operating perfectly. But the co level rose, even with the ventilation recommended in the manual. In my opinion this heater would be unsafe to use indoors. Too bad. As it beats beautifully. Guess that's why some states and Canada don't allow them. see less I would be VERY CAREFUL! I have a small 12 foot travel trailer. This heater seemed like the prefect solution to warm it up quickly and then switch over to the electric heat. I work for a small fire department part time so I have access to our co detector. I started up the heater, opened a window near it 3 inches so there was an open space of 3 inches by 18 inches. The heater worked wonderfully to heat the space. But quickly the co climbed and hovered at between 10 and 15 ppm. Not high enough trigger a normal house co detector, but enough to be a health risk. Limit on occupational exposure to co is 9ppm over an 8 hour period. At 10 to 15 limit should be a couple hours. Thebtilenis burning orange and every indication is the brand new heater is operating perfectly. But the co level rose, even with the ventilation recommended in the manual. In my opinion this heater would be unsafe to use indoors. Too bad. As it beats beautifully. Guess that's why some states and Canada don't allow them. AmazonShopperDavid · December 29, 2016 191 people found this helpful. Do you? | Report I have used this unit for individual room heating the last 3 winters without a problem. I just made it a point to keep 24 inches (2 ft) clearace in front of it, so nothing catches fire. A 20 lb tank was lasting about 3 days, with it running all the time on low (4,000 btu). well travelled · November 7, 2021 27 people found this helpful. Do you? | Report If it had combustion that didn't burn correctly it WILL NOT shut off and will fill room or van with carbon monoxide, my son Dennis W. Soule died because of this if you spill coffee on it you need to get it serviced before you use it again. Also you need to clean it quite often so it burns correctly. They say it will shut down if anything goes wrong. But in the next breath it tells you to clean it so you don't fill area with carbon monoxide because it will not shut off if this happens. He also had his van window opened 4 inches and that didn't save my son. deborah soule · March 20, 2021 69 people found this helpful. Do you? | Report These heaters do burn gas using oxygen and giving off some "exhaust", yet what these give off isn't the same as an engines "exhaust" that will fill a room in 5 minutes (like running a generator indoors will do and likely kill anyone inside). They do say in the manual to "Keep a window open at least 12 square inches fo… see more These heaters do burn gas using oxygen and giving off some "exhaust", yet what these give off isn't the same as an engines "exhaust" that will fill a room in 5 minutes (like running a generator indoors will do and likely kill anyone inside). They do say in the manual to "Keep a window open at least 12 square inches for ventilation" as a precaution to allowing gases to build up. I've tried this for 24 hours and put a CO alarm nearby to see if it would go off after 3+ hours, but it never did. As I thought about it I've wondered "How is running this much different than someone with a gas stove keeping it going to keep their coffee warm all day which is also burning gas?" How many houses have gas stoves and isn't there the same risk from those having a flame etc? I doubt there's much difference and most houses aren't sealed so tight to become a "gas chamber", so just as the keeping the stove burner on isn't a problem, I doubt this will be that big an issue for most. It may not be the best choice of heat for a long term use, but for even a week in a power outage or such it won't be anything like the danger of running a generator indoors. see less These heaters do burn gas using oxygen and giving off some "exhaust", yet what these give off isn't the same as an engines "exhaust" that will fill a room in 5 minutes (like running a generator indoors will do and likely kill anyone inside). They do say in the manual to "Keep a window open at least 12 square inches for ventilation" as a precaution to allowing gases to build up. I've tried this for 24 hours and put a CO alarm nearby to see if it would go off after 3+ hours, but it never did. As I thought about it I've wondered "How is running this much different than someone with a gas stove keeping it going to keep their coffee warm all day which is also burning gas?" How many houses have gas stoves and isn't there the same risk from those having a flame etc? I doubt there's much difference and most houses aren't sealed so tight to become a "gas chamber", so just as the keeping the stove burner on isn't a problem, I doubt this will be that big an issue for most. It may not be the best choice of heat for a long term use, but for even a week in a power outage or such it won't be anything like the danger of running a generator indoors. Thomas H. Lawler · March 28, 2018 74 people found this helpful. Do you? | Report This is a catalytic heater they do not produce carbon monoxide they are safe as long as they are working properly, they do not combust propane, it's a catalytic reaction. Forest H. · August 2, 2022 29 people found this helpful. Do you? | Report

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