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Tool Talk Discussion Forum

Shop Heating

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Jerry Cent. Mi.

10-10-2005 09:58:57




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I have decided to replace the shop furnace with an over head type. The shop is 12 feet wide and 24 feet long with an 8 foot ceiling and cement floor. I only heat it when I an in it and I need advice as to what size I should use that will warm it. The cement floor when its cold makes it hard to get the air to warm up. What brand would be good to use and how many BTU. I need expert opinion. Jerry

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Mike M

10-11-2005 05:48:37




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
I bought a hanging overhead heater by Mr. Heater it is called Big Maxx ( I think ) this is the power vented type just like the Modine Hot Dawg but less money. I think this was the first year they brought them out 45,000 btu has no problem heating my 32x48x10 insulated building to 60 degrees all winter in Ohio. I bought mine on e-bay but it was actually shipped from Northern Tool. I called Northern Tool to get one but they said they were out ? This was screwy but such is the sales world today.

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RickL

10-11-2005 05:30:14




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
Go with radiant heater period. I have 3 in my large shop and have beeen the forced air furnace,the wood stoves etc, radiant is by far the best to me period. Always have heat.



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Gusto Guy

10-12-2005 06:09:49




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 Re: Shop Heating in reply to RickL, 10-11-2005 05:30:14  
I for the past 2 years have used a 65,000 btu torpedo heater works ok, at least it keeps me warm, but what you have sounds much better could you pls expand a little bit on the type heater you use?
Thanks, Gusto



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RickL

10-12-2005 08:19:08




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 Re: Shop Heating in reply to Gusto Guy, 10-12-2005 06:09:49  
the one unit is a large ReVerberRay 54ft long the other two units are enerRadiant 54ft an da small low clearence 8ft unit I use for the office, I really like that unit in the office. The reverberray I think is heavier unit but the others have worked fine an just have a little cheaper heat shield fasten setup is all. I can't tell you the btu ratings off top my head now. have been in the shed for close eight years now. No way would I go back to forced air furnace for a shop. You would have to watch it in a paint booth because of pilot light,thou but in my shop work its not really not issue if I do have some really flammable vapor s I make sure the exhaust fans are running

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Jimmy King

10-11-2005 03:25:43




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
Jerry, I have a 32x40 with 12 ft side walls a 4/1 pitch. The ceiling is all that is insilated. I heat it with a 110 BTU Nat. Gas over head, on a 15 degree day it doesn't have to run long to make you unzip your coveralls.



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Jim Evans

10-10-2005 20:00:35




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
Get an overhead radiant heater. They heat the floor and do it with less BTUs than a forced air heater. I have one of these:
Link

45,000 btus heats a poorly insulated 30x32x12' sidewall pole building all winter.



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Charles (in GA)

10-10-2005 18:25:55




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
If you generate any used oil, and have neighbors who also can provide you with used oil. You might consider a used/waste oil fueled heater system. A horizontal burner, air handler unit mounted up on a steel frame on top of a large fuel tank, on which you can set filters and oil drain pans to drip out, is a good idea. The units can also be run on heating oil, so you have multi fuel possibilities. There are some very good ones on the market now that are relatively maintenance free and they generate alot of heat.

Charles

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Butcher

10-10-2005 17:23:11




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
These are pricey but, in my experiance they are well worth the money.



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upred

10-10-2005 16:35:04




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
I have a 20 by 32 shop that is uninsulated and heat it with a70,000 btu hotdawg by modine. I like it, i even bought one for my dads 24 by 36 shop both up in the up of mich. Any heater will eventually heat you garage it just depends on how fast you want to warm it up. Both of the modine units are on thermostats, when I get home I stop in the shop and turn it to heat, eat supper and go out to the shop and its warm as toast. I went with the bigger unit as I am planning on building a bigger shop now that my little guy is getting interested in the shop and tractors --- Rick

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Richard H.

10-10-2005 15:38:27




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
third party image

Jerry, my shop is a little taller and wider than yours but not much. In the left corner in the picture I have a diagonal corner shelf made out of 1x4" boards with spacing between them to allow warm air to get to the room fan that is on it.Just out from under it there is a 30K-btu ceramic LP heater on the floor. You may be able to see also in the corner back there is one of them rocket ship lookin LP space heaters at 60 to 100K btu to fire up when I first walk in to take the freeeeze off. And since my feet are sorta tired of life the floor carpet on it. Some of the best there is out of demo buildings, garage sales etc...Free. I"m with you, I only use heat when I have to go out there. Richard in Indy

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JMS/MN

10-10-2005 14:08:14




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
I built the shop in '82, floor heat at that time was not an issue. Put it in the new house in '97- but your question is for an existing building. If ripping up the floor and putting in floor heat is not an option- I just add this as a suggestion to recirculate some heat: I put 4 inch perforated PVC sewer pipe on my shop ceiling, plumbed into two heat sources- extra fan on the shop furnace plenum, other end into the fan on the radiator that gets hot water from the outside woodburner. Either fan pulls warm air from the ceiling and recirculates it into the heat source being used.

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RustyFarmall

10-10-2005 13:25:34




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
The overhead radiant heaters are the way to go. Might be more than you want to spend, don't know how much they cost. Ideally, radiant heat in the concrete is best, but if you are like me, hindsight is 20-20.



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george md

10-10-2005 12:50:29




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 Re: Shop Heating in reply to Jerry Cent. Mi., 10-10-2005 09:58:57  
Jerry, If you are going to an overhead I assume that
you are using gas or oil . I realize that an overhead furnace will save
floor space but it won"t heat the lower part of your space well. Use a house trailer furnace or
other counter flow type furnace , set just off
the floor on blocks and aim the opening in the
blocks at the area where you will spend the most
time or where you will be under a vehicle. Set the fan to run continuously but at a reduced
speed or slightly restricted flow , that will
move the cold air from the floor.

george

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Mark - IN.

10-10-2005 17:32:12




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 Re: Shop Heating in reply to george md, 10-10-2005 12:50:29  
I had a neighbor that did just that a few years ago. Worked pretty slick in his garage. Had two bays that easily held 4 full sized vehicals (2 in front of 2). I agree about going low. Heat rises, so get more bang for the buck and start low, let it do what it does naturally, rise on its own. Will help not having to heat more to try and fill the room with hot air to force it low.

I have 2 good sized vent free fire places that I'd replaced in the house. Had intended to use one in the barn (concrete floor) to fire up on those cold cold days. Barn is well vented, have no gasoline for the fumes to hug the lowest 18", so figured would be ok to use occasionally. But with the price of propane... more undies under the carhartts for me. Besides, if can't slip a wrench and smack an ice cold tractor or impliment with already frozen knuckles, winter wouldn't just wouldn't be the same and can't have that. Cheers.

Mark

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Slowpoke

10-10-2005 15:48:05




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 Re: Shop Heating in reply to george md, 10-10-2005 12:50:29  
Would a counterflow furnace be the same as a down flow? Luckily, I saved the old Coleman furnace from a '56, 8x40' mobile home that I dismanteled. I seem to remember it burns kerosene.



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