[Kirby64]

No it's not. It's just against code if they use a NEMA 5-15 outlet. If GP used NEMA 5-20 outlets and the appliance used a 5-20 plug, then there's no issue.

Many commercial appliances use 5-20 plugs. Also, lots of commercial cleaning equipment seems to use 5-20, which is why you see businesses tend to only use 5-20 outlets.

I'm not aware of any kettles that use 5-20 plugs but I bet they exist somewhere.

[lbourdages]

Yep my kitchen outlets are all the 20-amp specific ones, with the T slot.

[inferiorhuman]

IIRC NEC requires 20 amp circuits for the kitchen. However the only time I've seen a 5-20R in a residential kitchen is after the electrician got done with mine (he insisted code required the 20 amp receptacles).

[Kirby64]

It's not required, but it is allowed. And, the only thing you need to do is swap a 5-15 for a 5-20. No other work needs to be done and it's all compliant.

[briHass]

He's incorrect, unless it was a single receptacle. Meaning one outlet, the typical top/bottom (duplex) receptacles don't count.