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.
I was wondering how you got it out Bruce until I read how you did it on the last line.
Those immersion heaters sure do get hot to melt brass mate!
Buggar .
all it takes is a moment’s inattention.
Cheers
Dennis
Oops!

Gonna have to add low water sensors to your boilers
A good lesson for us all.
Even seasoned veterans occasionally make mistakes.
Thanks for sharing Bruce.