In reply to message posted by johnws:
The product you are looking for is called the Chilipepper 3000. Their website is http://www.chilipepper.com/. If you want to look at an alternative, the one Sylvan mentions is “Just Right” by Nibco, their website is http://www.nibco.com/newproducts/justright/.
Another one you can look at is http://www.autocirc.com/.
Thanks for the info SylvanLMP and Johnws…
I looked at the pages, (except chilipepper.com , which is irrelevant). The Autocirc is a similar device, but both it and the Nibco “Just Right” always bring hot water to the tap, whether you are going to use it or not.
The device I found had a pump in it and, as I understood, only brings water when you want it, I guess there is a button on it. The main purpose of it is SAVING WATER , not just to provide continuous hot water to the faucet.
Thanks again for the info, hope someone has seen the device I am searching for.