I don’t have hard numbers, but: the “7th generation” Miele combi-steam oven heats up absurdly quickly, only uses a 20A/240V circuit [0], and stays hot for quite

I don’t have hard numbers, but: the “7th generation” Miele combi-steam oven heats up absurdly quickly, only uses a 20A/240V circuit [0], and stays hot for quite a while if you don’t let it do its automatic cooling cycle. There’s just not enough power available to it for it to be inefficient — it can’t cost $310/year for electricity at $0.3/kWh to use it for 150 hours per year. The oven itself is not cheap, though. [0] At least here, a 208V element is not available. It works at 208V but not as well.