I think it depends on how much casting you are doing at one time.
Ask yourself if the current burnout is producing an unacceptable
level of smoke. I have a steam dewaxer but I do not use it most of
the time. This is because most of the time I am only burning out six
or fewer smaller flasks. I burnout overnight, so nobody is around
when the fumes are stinking the place up. But then I also cast in a
room that is separate from the rest of my shop, so maybe I can
tolerate a little more smoke. It takes more time to do the dewaxing
and you should move the flasks directly into a preheated kiln before
they cool. What I do with just a few flasks and no steam dewaxing is
have the kiln timed to start the burnout at midnight. If I had
steamed them I would need to have the kiln programed to be hot much
longer overnight or steam early in the morning and then burnout all
day and cast in the afternoon.
Bigger flasks need a longer burnout anyway and when I have a lot of
casting I will use the steam dewaxer. I have not noticed much
quality difference between steamed or not. 10 or more 4 inch flasks
are going to make a lot of smoke when they burn out. Better to put
them in the steamer.
You can steam dewax in a large stock pot on a stove or hotplate. But
if you have few enough flasks to do it that way, it probably is not
worth the bother.
DO NOT STEAM OUT CARVING WAX!!! It won’t work and will damage your