We have a Kitchen Aid we like really well. Very heavy. We have a hose attached to it instead of using the very small CO2 bottle that came with it. I think it is a 20# bottle that we get filled at the welding supply store. A bottle fill will last us about a year or more.

If you are interested in the adapter hose to a big CO2 bottle I can porbably look it up. Either got it off Amazon or Ebay. I know I got the tank one place and the adapter hose the other.

The Kitchen Aid mechanics is made for them by SodaStream and that is what water bottles we use. I think Kitchen Aid quit making the soda machines but there were some new ones still available on Ebay when we got ours.

If you are going to use a soda machine a lot to make soda water the big CO2 bottle and adapter hose is the way to go rather than the tiny refillable bottles.