I have an old stainless steel kitchen sink that's been lying around for a while. I think maybe I can get a hole cut in it for a water heater element and find some way to plug the big drain hole in the bottom. It would be a poor man's version of your eVaporator, but if I can add a valve to the drain hole, it might be almost as useful. I wouldn't expect 3 gph, but it looks about the size of a full size 6" steam table pan, so maybe 2 gph.