I would not run 20A(1900W) on that circuit though, without verifying that there is 12ga wire. 20A plugs are different than other plugs, one blade is sideways, and verticle. Alot of times, in older houses people will change a 15A breaker for a 20 because they were tripping the 15A. Theres a reason it was 15A for starters, because thats what the wire was rated for. If it's 14ga wire, and you run a 20A breaker, you can overload it and run the risk of an electrical fire...
But also, what was sead about adding the extra circuits is also true. As long as the main is not tripping. Even if all the slots are full, they make "piggyback" breakers that are 2 in the space of 1 so you can add more protected circuits.
If you upgrade the panel to 100A, the wire from the pole to the meter, and meter to panel will need to be upgraded as well.
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Dan Pesonen
Umm, a tank or 5
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