Unless the surface temp of the pan exceeds 450* F, the Teflon is safe. I used to boil wort in Teflon. How much room do you have between the stove and the hood?
To get volume on the cheap, try and find a used turkey fryer setup. The pot is usually 30 quarts, and the burners are usually 50K BTU. I want to suggest, if you can afford a larger pot, get one. I recently did a full boil of a 1.080 ale, and the 40 quart pot I bought really wasn't enough for me to be comfortable with a 8+ gallon boil. I agree with the consensus of many others, buy a big(er) pot to start with, at least 60 quarts do do a full boil of a big beer. Granted, 1.080 is not a big beer by any standards, physics dictate, the more grain you have the more water you will need to sparge it, and 60 quarts seems overkill for most 5 gallon batches. have a 22 quart pot I mash in, and both a 30 or 40 quart pot depending on what beer I am going to brew. I got lucky, I bought two turkey fryer setups, brand new for $20.00 each. 30 quart pots, and 50K BTU burners were just the ticket. I paid $38.00 for my aluminum 40 quart pot w/o a spigot, and am still deciding if I will put one in or not.
