One bad thing abou those adjustable mushroom heaters, is they need to be vented, and will stink you out of the garage.
i work on heavy machinery, and we have rental heaters at work [united rentals] that vary betweeen 30K inferred heaters, all the way up to a 1.5 million BTU heater
if you want the numbers off the heater i have, email me at
wanner@kc.rr.com it will keep your garage warm, you will love it!!
the mushroom heaters have a open flame and you can cook on the top of them, but since they are knee high, it would be easy to have something fall on top of it and catch the garage on fire.... also dont warm up the concrete to keep your butt warm!!!
here is what i would suggest,
go and buy a 35K btu heater that mounts on top of any 100LB propane upright bottle, and mount the heater to the top of the bottle, and your garage will be hot in about 30 mins, and the concrete will be warm after a few hours, and so will your butt.
one AWESOME thing about a radiant heater is they warm the objects up in the garage, ie concrete, car, tools ect and those objects keep the garage warm for alot longer than forced air or the mushroom heater.... imagine opening the window in your house, it gets cold quick doesnt it?
you can buy the heater and rent the bottles from
WWW.UNITEDRENTALS.COM they deliver, or you can pickup..
make sure that the rental yard is locked in on SUMMER PROPANE prices, we are, and it will save YOU alot of $$$
1 100 lb bottle of propane will run you 110 hours of continuous useage with that radiant heater.
email me if you have any Qs
BW