CEL. that is actually a very good idea. Boiling water does squat for cleaning the water. What an RO unit does is remove the crud that is in the water. Here is a test that you can do. Take a clean pot and put a certain amount of water in it, then boil off all of the water and then look at the pot. You will see a bunch of residue in your pot, this is the stuff that you want to remove with an RO unit. What CEL has told you to do is to collect the steam, which should be pretty clean water once it is condensed.
Oh yeah good luck cleaning your pot.
Scott