If there is one thing, I mean ONE THING, I've learned in my relatively short brewing history, is to take the plunge now and get the good stuff and you'll never have to upgrade. With that, I bought the banjo burner for doing 6 gallon full boils and in case I wanted to move to the dark side and go all-grain. It's adjustable and you can keep a roiling boil going with very little flame. You can also boil 6 gallons in about 5 minutes instead of waisting 10 to 15 minutes. There may be efficiency differences, but your not ever going to have 100% transfer efficiency going with these kinds of setups. I can do 4, 6 gallon full boils on one tank of propane, 20 pounder. One tank cost me about 13 bucks. Didn't do the math, but for the amount of electricity I'd use for the same amount of boiling with only partials, I'm sure it's way cheaper with propane. Plus, now with it being the summer time down here in good ol' SW Oklahoma, I don't have all the heat in the house the costs me more money, on top of all that, to keep the house cool with the AC running. No smells either!!