30x40 foot garage heating advice

[240zip]

I have a rather large garage (1200 sq ft) and a small budget. I picked up a nice Modine forced air heater (50,000 btu) ($200). It came with plenty of double-walled pipe. Unfortunately my garage has no gas. Running a line from the house involves trenching through a driveway and running nearly 150 feet of pipe ... perhaps more because it will likely go to the back of the shop. I can get a 110 gallon propane tank for about $300 (used). I simply want to make the back garage tolerable in the winter.

Any thoughts? One idea would be to put in the single Modine unit in one corner and then if another one crops up on Craigslist for a decent price ... buy it and augment the set-up with another 45,000 to 50,000 btu unit.

I'll eventually insulate and drywall the garage. It's currently frame, brick, and siding. The windows are Andersen double pane. The garage doors are insulated.

 

[Falcon67]

Just my opinion - the 50K ought to do it when you get the building insulated - and might do well enough as is. Sounds like the building is resonably tight already. Nothing wrong with using a propane tank and one that big they'd come and fill I'd expect. It's be cheaper and certainly easier to run the propane.