Julie, I just use a $10 hot pot from walmart or whatever and it works great. I set the pot at the low end of my steam setup and a lot of the runoff goes back into the pot and would steam for an hour or two at a time between refills.
Here is my $20 setup that worked quite nicely for pre-bending a tight handrail.
I ran 1/4" bolts through the black pipe about 1" up to support the work out of the water/runoff, and used a dremel(Foredom) to cut the spout off the hot pot and cut a circle in it to accept the white pvc. I have addt'l pictures of the setup if you wish. Have fun!