Garage heater install

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I am wanting to install a natural gas unit heater in my garage. The garage is 640 sq feet, with an 8 foot ceiling. I want to use the space as a car garage as well as a wood working shop. Am wondering about a good brand and best size of furnace. Also am wondering about clearances needed.
Thks.

 

[naturalgas]

Check out Rinnai direct vent heaters.


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[92nsx]

Do you have a Menards in your area? Are you a DIY'er? Total project on mine was under $700.

They also have a 45k btu. However for $50 more I'd go with the 75k. Mounts to the ceiling, up and out of the way

https://www.menards.com/main/heatin...91-c-6865.htm?tid=-786822626041576744&ipos=18

 

[polizei1]

If you're using it while woodworking you'll want a separated combustion unit. 30-45k Reznor UDAS would probably be a good fit.

 

[u3b3rg33k]

Do you have a Menards in your area? Are you a DIY'er? Total project on mine was under $700.

They also have a 45k btu. However for $50 more I'd go with the 75k. Mounts to the ceiling, up and out of the way

https://www.menards.com/main/heatin...91-c-6865.htm?tid=-786822626041576744&ipos=18

for 680 sq ft a 75k is probably way too big. louder, short cycling, and having trouble heating up the objects in the room will be symptoms of a system that's oversized. $50 to go bigger might mean $100s of headaches. I've helped out with two installs in bigger garages where a 60k is borderline too big.

 

[D45]

75k is way too large for 680 sq feet

45K will be perfect

 

[MrSurly]

We didn’t ask all the questions.... is the garage insulated? If yes, how or how well is it insulated? Is it an attached or detached garage?
A well insulated garage of that size could probably do fine with less than 30k btu.
UNinsulated, and maybe with loose doors and big air leaks might need 100k.

EDIT: WHERE is the other big one. Are you in Duluth or Dublin or Darwin or Dubai?
Come on, man, we need info...and we like pictures a lot, as well!

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[ratdoggy]

I have an attached 3 car garage. Ceiling is insulated and of course the shared wall with the house is too. The exposed wall isn't and the 45K keeps it nice. Just need a ceiling fan and maybe a small oscillating one to move the air around to lessen cold spots...