Kitchens and bathrooms should always have 20 amp gfci outlets. However, you must be using number 12 wire for 20 amp gfci or regular outlets If your wiring is number 14 guage then use a 15 amp.
As to can you have a GFCI 15 amp circuit the answer is yes if it is in addition to the required dedicated 20 amp receptacle circuit. The NEC requirement is for a 20 amp circuit to serve the bathroom receptacle (s). A 15 amp gfi receptacle can be used as it is two receptacles. Click to see full answer.
James, the GFCI code requires that a bathroom outlets are required to be on a dedicated 120 volt 20 amp circuit. The receptacle outlet which is located in the bathroom must be protected by a GFCI device which would either be a GFCI Circuit Breaker or a GFCI Outlet.
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Frequently Asked Questions
Are there GFCI's that are good for outdoor use?
WR gfci's have a coating on the electronics that prevents moisture from shorting the circuitry WR is a good idea in a bathroom and any outdoor location even if covered. It is more than UV resistant plastic. – Ed Beal Jan 25 '18 at 15:23