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/.
Wow John YOU ARE GOOD thank you