At most steps in my progression as a homebrewer, I have consistently under-bought equipment. For example, when I started kegging I bought a 5 lb CO2 tank. After I realized I burned through those too quickly, I went to a 10 lb CO2 tank, then, of course, I went to a 20 lb CO2 tank. That's just one example, I've gone through the same thing in nearly every equipment area. This has led me to the following guiding principle... when in doubt overbuy.
Anyway, back to CO2. I learned in this progression of tank sizes that it was just a little bit more to fill up the next size tank. $15 to fill a 5 lb tank, $20 to fill a 10 lb tank and $25 to fill a 20 lb tank. Filling a 20 lb tank vs a 5 lb tank, at those rates, equates to a 58% savings. Also consider the gas and time you're saving by filling up once instead of 4 times. It's been a while since I've checked the prices on the smaller tank sizes and, obviously, your supplier may be different.
20 lb. Aluminum Co2 Tank Compressed Gas Air Cylinder for Keg Beer - $107.95 (Save $32)+ $27.95 Shipping
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