[2010 SS RS]

Originally Posted by motorhead

twenty-five year heating and cooling pro here. I have a condensing gas furnace in my garage.
It's a lot more efficient than a Unit heater plus I have A/C on mine which you can't do with a Unit heater from Grainger. Radiant heat is okay as long as you plan on heating the garage all the time. It takes a long time for the slap to heat up plus if you don't maintain some heat it could freeze up unless you use antifreeze. I like being able to turn my heat off in the garage when I'm not using it and having it quickly heat up when I do. You can't do this with radiant heat.
For 2,400 Sq/ft where you live without knowing all the specifics on the building and not knowing what max temp you want to maintain I would say as a rough est. you need about 100mbh of output.

well lets put it this way...I live just east of Denver and on the coldest of days....Zero or so for a week on end the shed would just drop slightly below 25 or so at night. I have been using a forced air kerosene heater for the last 10 years and would heat it up once per day during those stretches to around 45 degrees. Used a 150,000 btu heater for about 20 min is all. The rest of the time during winter temps outside are generally lows of 20 or so. Daytime highs in the 30's and the shed never goes below 32 without suppliment heating.
So with that all said...No I am looking to blast it warm enough to work while I am out there...then it will probably be fine otherwise.. Do I still need such a large one? I was thinking if I got a 10degree rise I would only need 83,000 btu