Propane Heat: Eyes Burn?

propane heatPropane heat?

Still the most common source of home heating energy is fossil fuels, including natural and propane gas. Do you use propane heat?

Search the Internet and you will find individuals complain their gas heater produces fumes that burn their eyes and causes blurry vision. Why is that the case?

Although those who burn propane gas sometimes complain of “dry-eyes,” its combustion actually releases considerable moisture. Basic chemistry demonstrates why this is so. The stoichiometric equation is written:

CH₃CH₂CH₃ + 5 O₂ → 3 CO₂ ↑ + 4 H₂O ↑

We read, propane gas plus oxygen molecules yields carbon dioxide and water vapor.

Propane Heat – So Why Dry Eyes?propane heat

Now, although small quantities of carbon dioxide and water are found in our atmosphere, consider what water and carbon dioxide can produce if they exist in abundance:

H₂O + CO₂ → H₂CO₃

The above informs us that water plus carbon dioxide gas yields carbonic acid, H₂CO₃. Although it is not a particularly strong acid, acids are famous for burning the eyes. Why, the burning feeling one gets from chopping onions is due to the presence of an acid.



Besides, for every molecule of propane burned, there are four molecules of water produced. But there is almost an equal number of molecules of carbon dioxide produced. Although not all the carbon dioxide converts to carbonic acid, enough does that some of us complain, “My eyes burn!”

So if you are thinking of heating with with propane, be forewarned of the possible/probable difficulties you may experience.

What Can Be Done?

Other than changing the fuel used to heat the home, one thing that may reduce the problem is to spend as little time as possible in the room that houses the furnace. Along the same line of avoidance of exposure, one could heat the room, turn the furnace off, and then occupy the room some time afterward.

Note: You might also enjoy Chopping Onions Makes You Cry

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14 thoughts on “Propane Heat: Eyes Burn?

  • Vicktorya

    We use propane but my eyes do not burn. I think my eyes are bullet proof. I have been myopic forever, [though I am] doubtful that has anything to do with it. (Love your site!)

  • Natasha

    What if your source of propane heat is vented? Would that not pull all the by-products outside and reduce the amount released within the home? Or does venting not matter?

  • Tim Serafini

    I actually found a leak in my hose that I didn’t find the first time. Scary. I know. Fixed it. Keep checking it. Sensor did a good job at turning off the heater. Mr. Heater propane heater burning my eyes. It could have killed. Maybe somebody was trying to. My brother and sister are on my life insurance. Maybe I should stop paying into it.

    • I hear you! Well, about a week ago I visited the man who has a propane heater in his rather small living room, which led to my writing this article. OK. Well although the burning didn’t bother me too much, it put out so much moisture in the air and took up so much oxygen, I felt a little like I was being suffocated. The dampness, the heat, the missing oxygen.

  • Cap'n Dave

    I’ve lived in everything from a mobile home in Montana that used propane for the furnace, the oven, and the stove to a large, alleged travel-trailer (it was over 30′ long) that also incorporated propane for the refrigerator. Maybe it’s because all of this was vented? These days, I live on a sailing yacht. Propane solely for the two-burner stove, using those little 1-lb. bottles you can pick up for camp stoves. My eyes burn so badly that I can’t even see what I’m cooking sometimes! Yep – time to get the gimbaled stove/oven combo and relocate the bottle (in this case, the refillable 20-pounders) outside on the transom with a hose extension.

  • Joyce

    I have a new home with ventless gas logs, using propane for fuel source. I have noticed the burning of my eyes, watering, and runny nose when using the logs. I have read the info about the carbonic acid release. Will a different set of logs make this problem disappear or less of a problem?
    I had the same type of system in my previous home, and never experienced this type of problem. I love my logs and want dearly to be able to enjoy them.

    • Frankly, I’m not an expert on the devices. Of course, the chemistry is irrevocable. There are one or two things that might help. Naturally, venting is one of them. But “burning the logs” in a rather large room with good circulation (perhaps a ceiling fan?) may alleviate the difficulty.

  • Donna

    I cook in a very small building with a propane stove. The burners don’t have the right fitting on them and it burns my eyes and there is a lot of soot buildup on the burner. My eyes always burn and I feel sleepy. Is this causing me harm?

  • Garry Garrison

    Newly installed propane furnace here. It was professionally installed, vented outside. I’m now experiencing burning eyes and skin, but I’m the only one in the household. Could I be allergic?

    • I’m not even sure it is possible to be allergic to that! Likely, your eyes are drier, or for some reason more sensitive to it. Or you are exposed to a greater extent. As to burning skin… You might consider the possibility something else is at work.

  • Gail

    I used a butane torch on an art project, and when I was done the whites of my eyes were pure red. After a few hours I used eye drops for the redness. But my eyes do not feel the same. They feel dry and things are a little blurry. Thinking of calling my eye doctor today.

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