Defiantly open space, tobacco barn and alleyway of horse barn. And yes I am talking a salamander/torpedo type. It looks to me that a kerosene type may be less costly to run.
Cary
Not sure but I've never seen high btu propane units in that salamander configuration, the kero ones go over 200,000 btu.
I've got a 110,00 unit, they're great for fast portable heat, I think the portable part for me is a slight advantage over the propane. Well actually depends on what you consider portable, in one way the propane is more portable since you don't need AC electric cord, For me I'm using in or near shop so no problem for electric, I just don't want to move propane tank around with heater.
They are good if you have to work outside on a pc of equipment, just park the heater 8-10 feet away, pointing at the work area and you will be so much more comfortable than just being outside with nothing.
The multi fuel ability is a huge plus over the propane as well imo, you always have diesel around.
The down side is they are noisy to the point where you have to shout over them to be heard and they are "flame throwers" so you have to be careful, would not want to use them anywhere around hay.
Seen where a guy was cutting wood near one and the thing was sucking in the saw dust and shooting it out on fire
Also as mentioned, initial cost is higher, expect to pay close to $500 for a decent new one. though I'm sure you could get a used one for a fraction of that.
JB.