Using a heater with a small (barbecue) propane tank?

[stlbill]

A 4 gallon tank could heat a 11,000 gallon pool just 4 degrees F. How often would you like to change the tank?

[kelemvor]

I'm sure you could, but you might want to find a book on the subject or something. There may be different pressures and things that need to be adapted. I did the opposite; had the gas company run a line from my rented 120gal tank to my propane grill rather than filling the 5gal tanks.