UPDATE
So, I tried to boil water in a small aluminum pan sitting on the plate. It did produce steam, but only bubbles appeared on the bottom of the pan. It never reached a rapid boil. I doubt it would work well enough underneath a brass boiler. Perhaps if the plate could be bent to the shape of the bottom of the boiler, but probably not.
Anyway, it looks like I might have something to heat water for tea. It was a fun experiment, nonetheless.
[ Guests cannot view attachments ]