A contractor said to purchase GFI 20s but most are 15s. What is the difference? Thanks for any responses
GFCI 20 outlets have a slightly different slot that allows 20 amp plugs or 15 amp plugs to be installed. Instead of the two straight slots it has a side slot added.
15 amp GCFI
20 amp GCFI
If the breaker is 20 Amp, then use a 20 A GFCI.
It's only a couple of Dollars more than a 15 A, and it will allow you to run more than one small appliance at the same time on the kitchen counter.
If you can't find one at your local box store, get it on line or at an electric supply outlet - but get a reliable one.