Gas Heater

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Forum topic by Reaper417 posted 09-07-2013 01:56 AM 1910 views 1 time favorited 24 replies Add to Favorites Watch
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49 posts in 2421 days

09-07-2013 01:56 AM

Hey Guys, I decided I didnt want to freeze again this winter.I would like to put in a gas heater.I heard they have them that are ventless.My garage is about 800 square feet.Can anyone tell me what would be a good one for me and that size garage.I would only use it when working out there, garage is seperate from the house.Any help anyone could give me would be great. And always thanks in advance for your time…....Dave

24 replies so far

View 8iowa's profile


1586 posts in 3937 days

#1 posted 09-07-2013 02:24 AM

Many report that non vented heaters cause problems with moisture and rust. After all, the products of combustion are carbon dioxide and water.

I have a 35000 BTU Reznor gas heater, vented with the separate combustion feature. There is no exposed flame.

-- "Heaven is North of the Bridge"

View RobertT's profile


70 posts in 2957 days

#2 posted 09-07-2013 02:28 AM

My ventless heater will turn chemical smells into deadly fumes. I have no moisture problems.

View AlaskaGuy's profile


4645 posts in 2485 days

#3 posted 09-07-2013 02:32 AM

Just my opinion.

Ventless gas heaters are for those who are to lazy to cut a couple hole in their shop. No matter how good the technology there’s always the possibility something could go wrong.

Do the math to find out how many btu you need and get a small direct vent heater.

-- Alaskan's for Global warming!

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2125 days

#4 posted 09-07-2013 02:35 AM

my mom has had a ventless LP heater in her shop for years it does fine. she smokes and it filters all the smoke right up the wall.

View AlaskaGuy's profile


4645 posts in 2485 days

#5 posted 09-07-2013 03:06 AM

Well good for your mom.

I just think it’s better to error on the side of safety not the side of cheap and easy.. Like I said it just an opinion..

-- Alaskan's for Global warming!

View Grandpa's profile


3261 posts in 2852 days

#6 posted 09-07-2013 03:23 AM

When I inspect a home with a ventless heater, I always put in writing that they should never operate this heater without a functioning carbon monoxide detector in place. Just good business. They advertise wall heaters and gas logs for fireplaces as ventless.

View LeeinEdmonton's profile


254 posts in 3758 days

#7 posted 09-07-2013 04:10 AM

I have a gas 35,000 BTU radiant tube heater in my shop. It has gone through 3 winters with days that reached -30 C temperatures. The vent is out through a side wall where condensation is also discharged. Being radiant the power tools absorb the heat leaving them rust free. Sure beats the garage heater I had with it’s fan blowing over a manifold. All shops have some dust & that garage heater & it’s fan sure dispersed it all over the shop besides busily choking itself to death. Wish I had installed the tube heater 10 yrs before I did.


-- Lee

View TDSpade's profile


104 posts in 2592 days

#8 posted 09-07-2013 07:06 AM

There are numerous direct vent heaters on the market, in every price range. They vent straight out the wall so you won’t have to cut a hole in your roof. You will have to cut a hole in the wall.

If you do go vent less just make sure it is equipped with a good ODS (oxygen depletion sensor). It will shut down the heater if oxygen levels drop below safe levels.

I have been in the propane business 26 years 23 as a service tech. The company I work for and many propane companies will not have anything to do with vent less heaters.

Also go with at least a 35,000 btu heater, 50,000 btu would be better. I hear it gets cold in New Jersey.

And the tube heaters Lee is talking about are good too.

-- For every expert, there is an equal and opposite expert.

View jackthelab's profile


313 posts in 2869 days

#9 posted 09-07-2013 11:59 AM

I use a Hot Dawg vented heater by Modine in my shop. Bought it on line from some company in Nebraska. The little thing works perfectly. I have gone a couple of winters without heat and believe me I wouldn’t do it again. They have a simple chart that sizes the heater to your area on line.

-- Dave in Minnesota - If it ain't broke, improve it!

View Gene Howe's profile

Gene Howe

10988 posts in 3605 days

#10 posted 09-07-2013 12:28 PM

I use a PROCOMM wall mounted ventless propane heater in a well insulated shop. It’s the radiant type. It’s been installed about 6 years with no problems. We also use one in a large room addition to the house.
The shop is 24X36 and it heats it well. Our water pressure tank and pump are in the shop, so when night time temps get below 32, it runs on it’s lowest setting 24/7, except when I’m in the shop.
I understand the concerns about carbon monoxide. When the heater is on, a window is opened about 3”.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Fred Hargis's profile

Fred Hargis

5143 posts in 2670 days

#11 posted 09-07-2013 05:22 PM

Based on my experience with 2 of them, I’d suggest you skip the ventless. With the first one I had serious moisture problems, not on my tools but on the roof sheathing. That’s where it all condensed and was dripping on to the insulation above the garage (o vapor barrier in the ceiling). The second one I ran about 2 days in a place we had just bought before I tore it out and replaced it with a ceiling hung direct vent (outside air for combustion) heater.

-- Our village hasn't lost it's idiot, he was elected to congress.

View bondogaposis's profile


5055 posts in 2528 days

#12 posted 09-07-2013 06:11 PM

This is the one I have and it heats my 2 car garage very well. If you go to Northern Tool’s website they have calculator that will help you determine how many BTU’s you need.

-- Bondo Gaposis

View Gene Howe's profile

Gene Howe

10988 posts in 3605 days

#13 posted 09-07-2013 07:00 PM

I’ve never had a moisture problem using the ventless heater. But then, I’m in Arizona.
In a more humid clime, I might be hesitant to use one.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Reaper417's profile


49 posts in 2421 days

#14 posted 09-15-2013 02:29 AM

Thanks everyone for answering me. I see I have my work cut out for me.

View Brickman's profile


51 posts in 2547 days

#15 posted 09-15-2013 03:29 AM

Look at the Garage Guy heaters from Sterling. They can be installed with a concentric vent kit that allows them to have a sealed combustion chamber for increased efficiency and for safety in a wood shop. The best price I have found for them is here:


-- Mark - Pueblo, Colorado

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