Sun Aug 17, 2008 12:41 pm
If you rent a CO2 tank, you will need to put down a good sized deposit at most places. Depending on the place this may only be $10-$15 or as much as the cost of a new tank. You will get this back when (and if) you finally turn the tank in for good. If you take your time and shop around you may be able to find a tank to buy for what your deposit would be. I have gotten 20# tanks as cheap as free (abandoned by a dumpster behind a closed down bowling alley) to as much as $65 (including shipping) on eBay.
To determine the cheaper way to go take a look at the cost of refilling the tank vs trading in an empty tank for a full one. In my case, refilling a 20# tank is about $4 cheaper than doing an exchange. My fill place will fill it while I wait, normally a 10-15 minute wait. The only time I exchange a tank is when the tank is within a few months of needing recertification. Paying an extra $4 to get a tank with several more years left on it's certification is a whole lot better than paying $25 to get a tank recertified.
Owning your own tank gives you the flexibility of either filling or exchanging, while renting ties you to the rental place for fills or exchanges. You will need to look at what is works best for you. If you can do immediate exchanges vs having to wait a couple of days for them to send your tank to a 3rd party to do the filling, you may want to stick with the exchange route.
I know this doesn't really answer your question, but it should give you some things to consider.
Wayne
Bugeater Brewing Company