The answer: surprisingly (to me) very little.
Having just yesterday SV’d some baby back pork ribs for 20 hours, I started wondering what it was costing me in electricity, to run my Anova Precision Cooker for that long, or for any period, for that matter.
So today, when I was SV’ing some 1 ½” thick filet mignons, for 2 ½ hours, I thought I’d plug in my trusty Kill-A-Watt meter.
My last electric power bill worked out to a rate of $ 0.164/kW including taxes and fees.
I ran the Anova for 2 hrs and 51 minutes (which included the cooking time, and the 20 minutes it took to get from 120 F tap water to 140 F for cooking), and it used 0.67 kW.
So that cook cost me $ 0.10 (IE: just one thin dime).
It probably used the first 5 or 6 cents, just getting from 120 F to 140 F, and the rest of it while circulating the water, and keeping the temperature up to where it’s supposed to be.
My Anova cooking vessel has a lid which probably helps in reduction of heat loss (as well as evaporation), which would help to reduce the cost too.
I was quite pleased with the result of my little test but nowhere near as pleased as I was with the filet mignons.