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Tool Talk Discussion Forum

Shop Heater

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lucasd

11-17-2007 18:05:38




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I am looking for a heater for my 20 x 40 foot shop. It has 10' ceilings and one pured wall. I would like an electric heater. Any idea how may BUT's?

Thanks,

Lucas




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buickanddeere

11-18-2007 15:12:17




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 Re: Shop Heater in reply to lucasd, 11-17-2007 18:05:38  
Overhead Infrared electric. Instant on, instant off.



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Midwest redneck

11-18-2007 09:09:06




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 Re: Shop Heater in reply to lucasd, 11-17-2007 18:05:38  
In my opinion for the best money I would get a 75,000 BTU kerosene turbo heater. If the shop is well insulated then this should do fine. In my old workshop which was 10X 24 X 9high I used a 35K BTU kerosene turbo heater and it worked fine, even in +10F weather. Heated up to 70F no problem. just make sure there is a window to the outside so Carbon Monoxide doesnt do you in. I dont know what a Suspended LP heater would cost.

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bill mart

11-18-2007 10:54:42




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 Re: Shop Heater in reply to Midwest redneck, 11-18-2007 09:09:06  
before i went to a kerosene turbo heater i would go to the same type of heater only in propane.although you still have the same potential for CO poisoning(keep a window open) the fumes dont smell half as bad as the kerosene fumes.



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135 Fan

11-18-2007 11:13:52




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 Re: Shop Heater in reply to bill mart, 11-18-2007 10:54:42  
Propane construction type heaters put a lot of moisture in the air. Kerosene has very dry heat. I have a ready heater that I use diesel in, because it's cheaper, and it doesn't smell very bad at all. You do have to have a window or door open to vent fumes though. It's pretty efficient and if it's low on fuel, you just add some more. With propane you would need 2 tanks. Dave



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JoeK(WI)

11-18-2007 08:08:44




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 Re: Shop Heater in reply to lucasd, 11-17-2007 18:05:38  
With electric you are gonna need 220 and a electric furnace or more than one heater to heat that area.I would estimate pretty costly.Theres a simple formula for BTUs needed,that I've posted before based on CF,temp rise over ambient etc,I'll try to find it and post back.I went with a Modine Hot Dawg LP ceiling unit in my shop and have been very happy w/it.



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Lefty

11-18-2007 08:21:20




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 BTU Formula in reply to JoeK(WI), 11-18-2007 08:08:44  
Room area(LxWxH)x.133x degree of temperature rise desire...For instance,a garage 20'x12'x8'=1920 cubic feet Temp rise(-10 outdoor to +68 indoor)78 degrees So,1920x.133x78=19,918.08 BTU.So a 20,000 BTH heater would do the job,but would be operating a maximum output,unless bldg is tight and well insulated.Note#This is ONLY a rough estimator gauged for general heating of an average outbuilding.A well insulated tight building would require less heat,and a loose building or one with several windows/doors may require additional BTUs.

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Charles (in GA)

11-18-2007 13:46:44




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 Re: BTU Formula in reply to Lefty, 11-18-2007 08:21:20  
Doing this calculation with my insulated metal building yields about 4 million BTU's required.

Thats a 60x60x16eave steel building with a 12/2 roof. That works out to 66,000 cu/ft times 133 times 45 degree temp rise (20 to 65 and thats extreme for around here) and I get 398601000, and it appears you shift the dec two places and I get 3 million and 986 thousand. Is that right?

I've been looking at used/waste oil heaters and figure that a 250K BTU will probably make the place comfortable most of the time.

Charles

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Lefty

11-18-2007 15:19:36




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 Re: BTU Formula in reply to Charles (in GA), 11-18-2007 13:46:44  
60x60x16=57600 cubic feet of area,x.133=7660.8, x 45 degree rise=344736 BTUs req.

Multiplier is Point 133(.133)



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Charles (in GA)

11-18-2007 16:04:36




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 Re: BTU Formula in reply to Lefty, 11-18-2007 15:19:36  
You forgot to include the area from the eave to the peak. 16 ft eave, 12/2 means a 21 ft peak. Thats equal to a 60x30x5 area, thats another 9000 cu ft. plus the 57,600 equals 66,600 cu/ft.

Charles



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Charles (in GA)

11-18-2007 16:17:56




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 Re: BTU Formula in reply to Charles (in GA), 11-18-2007 16:04:36  
Sorry, in my original post I put 66,000, meant to put 66,600.

So thats 66,600 x .133 x 45 = 398,601 or 400K BYU.

Realizing that 20 degrees is kinda rare around here, lets bump it to 30 degrees raising it to 65 degrees.

66,600 x .133 x 35 = 310,023 so my original guess of 250K BTU heater is not far off. Lost of variables of course. This building has one wall (east, morning sun, = good) that is a 14hx56w door system skinned with translucent fiberglass so no insulation there. Also a north side 10x10 sheet metal roll up door, and a west side 12wx14h glass garage door (west sun = afternoon warmth) plus a couple of man doors with glass in the top half.

Even on a very cold morning, when I step into it, it is surprisingly warm inside, I've never seen it reach freezing inside in the 7 years its been up, and usually won't go below 40, so I could back off my temp rise requirements even further.

Charles

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buickanddeere

11-18-2007 15:12:51




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 Re: BTU Formula in reply to Charles (in GA), 11-18-2007 13:46:44  
1 watt = 3.41 btu



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Gary from Muleshoe

11-18-2007 05:33:12




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 Re: Shop Heater in reply to lucasd, 11-17-2007 18:05:38  
I have approximately the same size shop at work that we heat with an electric 30,000 BTU heater. Our climate is somewhat moderate here but if it does get down in the 20s that heater run constantly. Let me tell you the electric bill for the shop is outrageous when it is like that.
Glad i don"t pay the bill.
If you live where it is cold most of the winter you may want to rethink the electric heater. Maybe a wood burner.

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steveormary

11-17-2007 19:56:37




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 Re: Shop Heater in reply to lucasd, 11-17-2007 18:05:38  
Lucas;

An electric heater sized for your shop would keep it comfortable but may take awhile to warm it up if it is cold.

steveormary



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Carl K

11-17-2007 19:05:34




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 Re: Shop Heater in reply to lucasd, 11-17-2007 18:05:38  
If your shop is well insulated and you live in a moderate climate, 30,000 btu will slowly heat it. A 5000 watt heater puts out about 17,000 btu. In our area two of those heaters would cost a dollar per hour to run. My well insulated shop is 22x32. I chose to go with a used high efficiency 50,000 btu LP furnace (150.00) and set a 120 gal tank just outside. Live in WI.



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circus

11-18-2007 04:48:24




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 Re: Shop Heater in reply to Carl K, 11-17-2007 19:05:34  
Carl Where did you get a 50k HELP furnace for $150? I live in Wi.



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Carl K.

11-18-2007 08:28:49




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 Re: Shop Heater in reply to circus, 11-18-2007 04:48:24  
Bought used 50,000 LP furnace from a small heating contractor who advertised in local paper. It's ten years old, high efficientcy, and vents through pvc pipe to outside. It was replaced for a larger unit because of house addition. Works great.



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