Specs say they draw up to 2.5 amps. That's 60 amps in a 24-hour day at 100% duty cycle. My guess is they use half that unless you keep opening them and putting warm stuff in.

Edit -- just looked again and there's a larger model that draws up to 3.6 amps x24=86.4A at 100% duty cycle. Still probably runs at 50% duty cycle normally and that would be closer to 50A not 100A