shop furnace

   / shop furnace #21  
   / shop furnace #22  
my shop is 14 x 24 with 8 foot ceilings, insulated overhead 7 x 9 door, 36 inch walk in insulated entree door,and two insulated windows. It is studded walls with 1/2 OSB on outside with pole barn metal sheeting covering that. 4 inch wall fiberglass and 6 inch ceiling fiberglass with snow white pole barn metal on interior walls and ceiling, concrete floor. I heat it with a Inferred 30,000 btu vent less wall hung heater, it is thermostatic control and on 1 it will maintain 52 degrees F on 2 it will keep it 65 degrees F , I picked this one because it was 99.9 efficient and at worse the biggest repair bill I could ever have was $200 and 15 minutes to hang another new one . when it gets down to 20 F I have a small 6 inch fan that I hang on a wire to blow the heat back to the floor, Over the last 6 years I had it on its own tank and could tell it used around 100 to 150 gallon of propane for the year , for me it is the wind that is the factor , I had it in my house for 4 years prior to that and it is 1040 sq foot then I went to a wood stove , but had to by another new wall heater to make the insurance company happy as they would not insure a house with its primary heat being a wood stove. I am 100 mile south of Chicago but it seems like the last few years the cold has been been going south of me down to you.
 
   / shop furnace #23  
I dont think that calculator is accurate at all. So I wouldnt trust it.

My house is 26x48.....and using 16' for ceiling as there is 2 levels heated.

R13 in the upstairs walls. Downstairs is uninsulated poured concrete walls, and a concrete floor.

I did a comprehensive manual J on the house. Factoring in window sizes, what direction they face, doors, etc. To keep my house 70 when its 0 outside.....calls for 48k BTU

According to that calculator....it says I need over 100k BTU :eek:

My shop is 40x40x14. I have a 120k BTU brunco wood burner down there. I have no trouble at all going from 40 to 70 in just a few hours even when its single digits outside. For the size of your shop....I think 40k is gonna be plenty. That comparable to a 3.5ton HVAC unit. And 3-4 ton units are the norm around here for an average size house. Your shop would be comparable.
 
   / shop furnace #24  
My shop is 30x30 with a 12 x 12 side room. All walls and ceiling have R 19 fiberglass insulation. I can put a 1500 watt electric heater in it, leave it on for a day and the whole shop will be 60F when it is below freezing outside. Of course you cant open up the garage doors and expect it to stay warm.
My neighbor gave me what I think is a 200,000 BTU diesel torpedo heater that I could set outside the doors if I wanted to open them and blow the hot air inside and I think it would keep the whole shop like a summer day.
We used to use the much larger ones on 2 sided open shops when I worked construction just blowing hot air inside and they worked really well. Of course they required about 50 gallons of diesel per day to operate. I don't know how much mine would burn as I have not used it since my neighbor gave it to me with a full tank of diesel.
 
   / shop furnace #25  
My shop is 40 x 60. 12' sides. We have a reznor UDAP that does a fine job. Actually have 2 systems. Have a boiler with heated floors and the reznor. The floors are the primary heat with the air handler t-stay set 2 degrees below the floors to act as make-up heat.

The air handler can heat the place on its own, but warm floors are so nice
 
   / shop furnace #26  
I finally got my old Reznor RA-110 110,000 btu Waste oil furnace set up in my new shop, a couple of weeks before Christmas. Shop is 30 X 32 X 12. Beside it is a circa 1939 Florence Hot Blast wood & coal stove, made in Columbus, OH. I set the WO furnace @50º, then fire up the stove when I working out there. I found out long ago, keeping the concrete floor fairly warm, makes heating the shop a lot easier.

I got this furnace just as fuel oil prices started to climb. I had a 120,000 btu fuel oil furnace in the other one, and would go through about 450 gallons of fuel oil, in an average winter. When fuel oil was .80 cents a gallon, that wasn't much of a problem, as I spent most my time puttering in the shop, and still do. The WO furnace, which I bought used, paid for itself the second year. I have several neighbors that save their oil for me, and in fact, need to go pick up 150 gallons off the neighbors son-in-law when the weather breaks. It's pretty nice having some buddy's that farm, and drive semi, and have some heavy equipment for off season income, that service their own equipment.
 

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