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Shop Heater

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DJ in NH

01-13-2002 18:17:22

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I recently built a 24' x 26' workshop and would like to install a oil fired hot air furnace for heat. I am not sure what the btu load is but would think some were around 40,000 btu's would do the trick. The bulding is well insulated and has high e doors and windows.

My question is does anyone manufacture one that small? All the ones that I have seen start upwards of 80,000. I know that you can down size the burner nozzel but by 50% seems a bit much. Also I would think the correct size unit would be more compact in overall size. I know that if I swithed to LP I would have a better selection to choose from but I would rather stick to fuel oil if I could.

Thanks for any and all comments.

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Rod(NH)

01-14-2002 19:18:04

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Re: Shop Heater in reply to DJ in NH, 01-13-2002 18:17:22

I agree fully with bc. You need to determine if you are going to keep the place heated ALL the time, like a living space. If not, go big. Certainly a mobil home unit in the 80-100 kbtuh range should be your goal, in my opinion. I have about the same size workspace as you mention. It is NOT heated all the time. Everything in there gets to ambient outside temp, walls included. I use a 140 kbtuh salamander when I am going to use the place "to take the chill off". At zero deg It takes quite a while to get the space up to comfortable...measured in hours, not minutes. By the time it's nice and warm, my work is usually done! Just my own thoughts.

Rod

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01-14-2002 09:12:46

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Re: Shop Heater in reply to DJ in NH, 01-13-2002 18:17:22

If a heater twice the btu s you need is available cheep I would go with it. With the thermostat set at your desired temp the larger heater should run about half the amount of time the smaller one would run. Also if you dont keep heat in the shop constantly the larger unit would be able to warm the place up to a comfortable temp. quicker than the just adequate sized unit.

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01-14-2002 04:49:44

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Re: Shop Heater in reply to DJ in NH, 01-13-2002 18:17:22

A hot air furnace out of a house trailer is more compact in overall size. However the air blows out the bottom of the unit so you would have to put it on a stand off of the flour so you can direct the heat in the direction you wanted, with a ceiling fan to disperse the heat evenly. This is what I have and it works real well. Set the thermostat control it will probably use the same amount of fuel rather it is 40,000 or 80,000 btu unit.

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01-13-2002 19:23:06

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Re: Shop Heater in reply to DJ in NH, 01-13-2002 18:17:22

There was a slick build it yourself waste oil heater on this site just a couple days ago. Check it out. It would work on fuel oil too I bet. And cheap to build. As well as a tested design.

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JesseH

01-14-2002 08:02:28

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Re: Re: Shop Heater in reply to CJ, 01-13-2002 19:23:06

I used to work in a shop heated by an expensive waste oil heater. Unless you use just your own waste oil and know exactly what is in it, I would stay away from those heaters. More crap gets dumped into the waste oil barrels, and most of it won't burn. We spent more time changing filters and trying to get it lit again then working. This was an expensive newer heater too. If you aren't using that much oil and know it is "just oil" would probably work fine. Myself, I would go for a propane heater, alot of good choices, and quite compact.

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Dusty

01-14-2002 10:10:10

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Re: Re: Re: Shop Heater in reply to JesseH, 01-14-2002 08:02:28

I a gun type oil furnace the oil is forces trough a nozzle at 100 psi.the hole in that nozzle gets too small for the oil to pass through below 80,000 btu.

I would be very carful about a waste oil heater.
1 You need a license to haul waste oil.
2 Your insurance co. may not pay for a loss if caused by a non listed-aproved heater.
3 If someone is serious injured or killed you can be charged with a felony.

In any shop it is best if the heater has a sealed combustion chamber with combustion coming from outdoors-- wood dust. Or at least off the floor a couple of feet-- gasoline/oil.
Radiant type heat very good for shops where doors are being opened often.

Good luck,
Dusty

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JerryU

01-14-2002 11:58:39

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Re: Re: Re: Re: Shop Heater in reply to Dusty, 01-14-2002 10:10:10

Dusty, you make a couple of good safety points regardless of the type of heater. If you are working around machinery and gasoline, make sure your flame source is at least 18 inches above the ground. If you use a portable kerosene or fuel oil heater, put it on a stand or milk crate. Gasoline and propane fumes hang low to the ground and can ignite.

If you are a wood worker or spray paint, then you need to have a combustion chamber that is not in the area or you may go bang!

Finally, ventilation is important. If you have a non vented heat source such as a bullet heater or kero heater, be ware that carbon monoxide hangs low to the ground and if you are under a car, it will put you to sleep quickly.

Might want to invest in a CO monitor for the shop.

FWIW,

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