I was wondering why the Kill-A-Watt wattmeter that I normally leave things in the room plugged into was beeping. Turned out that having an electric kettle and a space heater both on on a circuit were enough to drive the power usage over the 1800W that a normal US household circuit can provide, and that apparently the thing beeps in that case. It let me flip off the kettle before the circuit breaker flipped, which was nice.
I think I might look into a low-wattage, vacuum-insulated (to help compensate for the fact that the heat will have to be put into the water over a longer period of time) kettle.


I’m pretty sure both of those devices are intended to be the sole device on a circuit. It’s the only way you can get enough power for them.
The instructions should note this, but who reads those? Haha
I run into this in my kitchen (which was built before code required microwave on its own circuit).
I can run either the espresso machine (1100w) or the toaster oven (300w) and microwave (1000w) simultaneously. If I forget and run all 3 it will blow the breaker.
Fortunately my morning routine is coffee first, then use the toaster oven, then microwave. I only found out they were all on the same circuit by changing my routine.
Neat the kill-a-watt caught this for you.