Looks like it's safe to post again. Yahoo!

>> What kind of water capacity does your commercial unit hold?

I have an under sink model, which looks like it could hold maybe a half-gallon. Yours sounds bigger.

It might be tricky getting a fast enough response from the temp sensor. The tube and epoxy might slow things down with the extra mass. But ya gotta isolate it somehow I guess.

... mechanical back-up ... good idea.

Can't wait to see what happens.

DT