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AR15.COM
8/9/2017 5:07:47 PM EDT
Daughter and her husband are remodeling a house built in 1928 and are installing a ventless fireplace fueled by natural gas. I have some anxiety regarding carbon monoxide. They will be installing ventless fireplace logs with some type of detection sensor on them that will turn off the fire when the oxygen level is too low.

In read that carbon monoxide is lighter that regular air and will rise. Kids bedrooms are upstairs and I am afraid they could become a victim.

What is your experience?
8/9/2017 5:11:32 PM EDT
[#1]
My experiemce? They use a shitload of NG, I turned mine off, the pilot light, etc and never use it. I have a buddy who uses the hell out of his, he isn't dead... They actually heat a lot more efficently than Log fire with a chimney.
8/9/2017 5:13:11 PM EDT
[#2]
CO is lighter than O2 but heavier than nitrogen. Room air is only 21% O2, so a detector can really go anywhere. I have 2 of them placed around my water heater plugged into outlets at normal outlet level. YMMV.
8/9/2017 5:13:46 PM EDT
[#3]
My parents had one and a friend does. I think they are well worth it.  Detectors should be used though.

I might get one before this winter.
8/9/2017 5:14:46 PM EDT
[#4]
We had one at our last house. Pretty common in New builds here. I haven't heard of a single issue with them being used. They are more efficient if a nearby window is cracked.
8/9/2017 5:14:48 PM EDT
[#5]
Buy them some CO2 sensor alarms if you are concerned.
8/9/2017 5:19:26 PM EDT
[#6]
They install them in nearly every new house built these days.  I'd think if they were really that dangerous, there'd be dead people everywhere.

Personally, I like the smell of wood.
8/9/2017 5:20:14 PM EDT
[#7]
I had one in a rental last winter.  Took forever to put out heat and it wasn't much heat.  Luckily there was a real central heater in the shack. 
8/9/2017 5:21:30 PM EDT
[#8]
My concern would be the condensation of all the water vapor put out during the combustion of the natural gas.  I've seen in older houses that had the stand-alone gas heaters where water was running off the window sills on cold days from that same condensation.
8/9/2017 5:22:29 PM EDT
[#9]
They are not legal in California, Massachusetts, or Canada.
I'm a mechanical contractor who has been installing natural gas for the last 29 years.
I have no issues with conventional gas fireplaces but I wouldn't touch a ventless unit.
I am not putting my life in the hands of a CO detector.
I am also certified to calibrate gas detectors and I still won't trust my life to them.
8/9/2017 5:24:22 PM EDT
[#10]
Not sure why some people are saying they don't put out much heat.  I have one in one of my rental cabins and it puts out way more heat than the cabins I have with vented fireplaces.
8/9/2017 5:30:15 PM EDT
[#11]
Had one in the house we bought (this one) and it had problems with bad thermocouple. So since it was cheaper (when you can buy it cheaper) and we also decided to move it. We replaced with a direct vent and put it in the corner.

I never liked a vent free due to the fact that when something burns the residue has to go somewhere and too many stories of people dying of carbon monoxide (all though I know of no one for a vent free fireplace) from other fire devices that are not vented.
8/9/2017 5:31:26 PM EDT
[#12]
I had one at my first house. Ran it off 100lbs propane tank.

It worked well and kept the entire house warm.

Small house. A cape type home
8/9/2017 5:32:28 PM EDT
[#13]
If it is on an outside wall, put in a direct vent unit.
8/9/2017 5:33:30 PM EDT
[#14]
We have one and its been good as a back-up heat source when the electric has went out. We light if maybe 2 times a years to make sure it works.
8/9/2017 5:34:45 PM EDT
[#15]
We have one.  Never use it.  

First off, it stinks.  Secondly, the builder put an oak mantle above it so we don't want to ruin the oak.  

Thirdly, and most importantly, I don't like putting poisonous fumes into my house.
8/9/2017 5:35:15 PM EDT
[#16]
Most new homes in PA have conventional gas fireplaces. I have one and like it.

I would avoid ventless especially in a new or relatively air tight house.
8/9/2017 5:43:59 PM EDT
[#17]
Quoted:
They will be installing ventless fireplace logs with some type of detection sensor on them that will turn off the fire when the oxygen level is too low.
View Quote
ODS (oxygen depletion sensor) - Mandatory on every modern unvented gas heater.

I've installed unvented gas logs in 3 different relatives' homes - and they all love 'em.

In each case, I shoved several feet of fiberglass insulation up the old chimney before closing the damper.

They're super-efficient, because none of the combustion heat escapes outside.

The moisture they produce is an advantage - Keeps the humidity high enough to prevent dry skin, cracked lips, nosebleeds, etc.
8/9/2017 5:46:13 PM EDT
[#18]
I have a ventless fireplace in my home. I replaced a ventless wall heater with a ventless corner fireplace. My home is about 30 years old and isn't as tight as a new construction. It puts out a ton of heat for the size and doesn't require electricity so it is a backup to a pellet stove and forced hot air furnace. I have several CO detectors in the home and I don't use it through the night. I haven't had moisture issues, but they do put off a fair amount of water. If you have a tight, new home, you may want to go vented.
8/9/2017 5:51:50 PM EDT
[#19]
Have one, it does fine. I have a co2 detector and will crack a window if going to run it awhile.
Puts out a great deal of heat, but it does use the gas. It's primary for emergency heat.
8/9/2017 5:58:18 PM EDT
[#20]
Our main fireplace is real, but we have a ventless LP gas one in the bedroom...We NEVER have it on except in winter to warm room before bed. It works great for that though. Too much risk of CO poisoning.

I would not want to stay in a house heated by a ventless fireplace, although years ago, many folks used gas space heaters. But back then, house's were a lot less sealed up!
8/9/2017 6:03:15 PM EDT
[#21]
Quote History
Quoted:
They are not legal in California, Massachusetts, or Canada.
I'm a mechanical contractor who has been installing natural gas for the last 29 years.
I have no issues with conventional gas fireplaces but I wouldn't touch a ventless unit.
I am not putting my life in the hands of a CO detector.
I am also certified to calibrate gas detectors and I still won't trust my life to them.
View Quote
.

Listen to this guy.
8/9/2017 7:46:04 PM EDT
[#22]
A lot of cool things are not legal in California and Massachusetts.

My vent free Nat gas heater works well.   Older home, keep a window cracked.  And it's in Florida, only about 4 weeks a year it's needed.
8/9/2017 7:52:16 PM EDT
[#23]
I had one in my old house... no way would I ever get one again.

We only periodically used it but every time we did I'd get a huge headache.
8/9/2017 8:31:11 PM EDT
[#24]
Read the instructions, especially the part about sf per btu, and install it according to code and you won't have any problems.  A couple of CO monitors are a requirement whether you install a vented or a ventless fireplace.