I think my big Presto is a 16? I purchased an 8qt for cooking. Alot of pressure cooker recipes out there too.
In 30 minutes I have pork ribs ready for the sauce and sourdough buns....
Easy to make stocks as well, very fast.
Watch the BTU output of your heat source, they say keep it under 9000 iirc.
I think an outdoor kitchen would be cool, some days it might be too warm over here though.