Circuit breakers

Hi all, am I to understand that the '20's stamped on the ends of the levers of 6 of these circuit breakers indicate that these are 20amp circuit breakers? If so, what is the meaning of the text '10kA' written on the body of each circuit breaker? Two of these protect separate GCFI receptacles in my kitchen, and as I plan a heat stick build for winter brewing, I want to make sure I am purchasing a pair of heating elements (one each to go on separate circuits) with safe wattage ... With 20 amp circuits, i'm good to go with a pair of 1500W elements (one on each circuit), right?

Whoops, sorry, here are the breakers in question ::

10KA indicates the breaker will properly interrupt a maximum 10,000 amp fault current and must not be used on systems capable of delivering more.

Awesome, many thanks!

Yup, you have 5 single 20amp, 1 single 15amp and 1 double 20amp (220v).

Fantastic, thanks!!