Within 30 minutes of posting Steam: Part I, it was pointed out to me by a distant relative (my son, but he lives 3,000 miles away) that I have a social responsibility to mention that in my zeal to create steam in my own kitchen, I had destroyed not one but two ovens (three, if you count that I destroyed the second oven twice).
550 degree steam and electronic controls don't mix. I totally fried the electronics panel of oven #1 and was forced to move to oven #2 where I managed to produce a small explosion.*
BTW, it's my opinion that the main reason for electronics in ovens is to guarantee built-in obsolescence. My mom has an oven built in the 1950s that's still going strong. A bi-metal strip for a thermostat, heater coils, that's all you need, but if manufacturers still built ovens like that, they'd never sell any new ones.
*From the shameless promotion department...if you want to hear the full story of my exploding ovens, my argument with the appliance repair man, and what not to tell your spouse when you bake...the full story is revealed in excruciating detail in 52 Loaves: One Man's Determined Pursuit of Truth, Meaning, and a Perfect Crust