Lew Hodgett wrote:

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Don't know you're budget, but this unit would do a good job.

http://tinyurl.com/mqmcye5.

They indicate they are presently out of stock, but there are other
suppliers with the same device or other brands of similar size.

Lew
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"Ed Pawlowski" wrote:

That puts out 17,000 BTU. but you need a hefty circuit for it.
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Didn't see a BTU rating.

Unit is rated at 5000 watts, 26.1 A @ 240VAC.

A 2P-40A c'bkr and #8 AWG should handle the job.

Unit is sized for 525 sq ft.

A typical 2 car garage is about 20x20 or 400 sq ft.
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You can get almost 4X the heat at half the price with propane
http://www.northerntool.com/shop/too...5167_200485167
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You also get to deal with the products of combustion in a closed
environment.

Lew