I saw this hot water recirculating device at costco. It reduces (eliminates)
the time for hot water to travel to distance faucets by circulating the hot
water.

http://www.wattspremier.com/watts/sh...ID=181&CATID=1

It looks like the water sitting in hot water pipe is being pump into the
cold water pipe, which eventually loops back into the hot water heater.

Has anyone installed this, and does it work well? Does it increase the
heating bill significantly?