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The one I installed in my vacation home is specifically to keep the pipes from freezing. It pumps the warm water into the cold line through a check valve (under the sink at the farthest point from the water heater) and it back flows back to the water heater so there is no water wasted and the water in the cold line is not only moving (whenever the pump comes on for the hot water), but it heated to about room temp. I have it set up so I can turn the hot water heater and the recirculation pump on from my phone when enroute or when the temp drops below about 25F.
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74 Targa 3.0, 89 Carrera, 04 Cayenne Turbo
http://www.pelicanparts.com/gallery/fintstone/
"The problem with socialism is that you eventually run out of other people's money"
Some are born free. Some have freedom thrust upon them. Others simply surrender
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