"Jeff Wisnia" wrote in message
...
Rich wrote:

I've wondered about those kind of units. Perhaps you can satisfy my
curiousity:

If, after pushing the button and using some hot water, you want to draw
a glass of cold water. Do you have to leave the "cold" water running for
a while to get the tepid water out of it's line before it becomes cold?

Thanks,

Jeff

Does this unit pump the water back through the cold line? I see there are
only 2 fittings coming out of the pump. Wouldn't a dedicated pump return
line be necessary to keep the problem above from happening?