Boden wrote:
Yes. It's a resistive load, just like a light bulb. I find it
difficult to believe that 15 amps is correct, that would be 1800 watts
which will do far more than warm a coffee pot.

If you use the Lutron dimmer, make sure that the warmer is under 300
watts, or get one a bit more robust.

If it's controlled by a thermostat wouldn't lowering the voltage just make
it take longer to reach the same temp?