I don’t think I got this across enough in my article - thanks for reiterating that! Filling a whole sink to do dishes once a day, sometimes twice, is a lot of water compared to what this thing uses.
It is 120V AC, and I use it on the inverter. The specs say it uses about 950W of power, but I’ve not seen it go quite that high. It is heating the water, but if you use the 15 minute cycle, it’s not for that long, and definitely not for the whole 15 minute cycle. You can see more specs here if you’re curious.