On Mon, 09 May 2011 16:39 -0300, "Gerhard Fiedler"  wrote:

> There is the possibility of having a small backflow pipe with each hot
> water pipe, inside the insulation, and force a small amount of flow at
> all times, from the end of the hot water pipe back to the hot water
> reservoir. This would of course increase the energy losses, but it would
> also reduce the amount of water wasted. Has anybody experience with such
> a system?

There are two versions. One runs continuously. Not very popular now that
electricity is no longer unmetered. The second is a demand based
recirculator that pumps fast and furiously for two seconds when it
senses you turning on the hot tap. The return line is full size.

I had a house with the first system, always left it switched off. Since
it was already plumbed for recirculation, I could have added the extra
gizmo to modernize it, but didn't.

Bob

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