just got done with a fresh modification on an engine, filled my water jug with distilled water...thought I filled the boiler with water...DIDNT !
before...
after a 3 minute 110V warmup with no water in the boiler....it only caught my attention because I noticed the cherry red glow of the immersion rod inside the boiler, it was worth it though as a test , it never did become un-soldered , and although the actual immersion rod got exposed in a few areas it still worked & didn't leak.
it was a bit of a task to get it out & replaced, ground it off in back & dropped it through the porthole window in front.