Garage heater question

[Heypal]

I recently bought a used Modine natural gas hanging heater for my garage. I just got of the phone with a Modine rep and he said the heater is 2-3 times what I need. He went on to say that it will short cycle and may not be the best choice. I knew the heater was too big, but picked it up at a reasonable cost so I thought what the hell. My garage is 22' X 24'. Am I going to regret installing this puppy? Also, what diameter vent should I use?

 

[Sambo11]

I have the same problem with mine. Fell into that "a bigger hammer must be better" theory. Best thing I did was insulate the heck out of my shop. I'm not gonna say it still doesn't short cycle cause it does but it holds the temp ALOT better than it ever did and that has to help with the amount of times it short cycles.

I talked to a HVAC person about it once and they told me my heater probably uses more gas because it's to big for the application and it short cycles than a smaller furnace that ran longer cycles would use.

 

[Gimpster]

I wouldn't worry about it. We have a 24x24 garage at home and put in a huge hanging heater that I had in another shop. The only changes I made were with the thermostatic fan and gas kick on sensors. After buying a number of different temperature sensors trying to get it right, I installed adjustable sensors. Set the furnace where it works great and haven't looked back for 6 years. I went with 8" pipe going out but wish I would have dropped the size to 6" (all double wall pipe of coarse)

----- Gimpster -----