Sounds to me like a cheap john that you had to put salt in to get it
to work the first time!
The salt makes the water conductive between two plates and it does
boil, but by the time the bubbles get to the top of the column of
water and out the hole, they have been water cooled, hi hi.....
Professional steamers the output steam is usually at around 250
degrees. Some do this by maintaining a certain internal pressure,
others by reheating the steam vapor from the boiler as it passes
through an inline reheater.
My DW bought a red steamer, I measured the output temperature and it
was only around 185 degrees unless she used the pinpoint nozzle, then
it jumped up to around 200 degrees. It's better than most, but
nothing like a professional model.