On Nov 29, 3:45 am, "Bob" wrote:
"peter" wrote in message

news:[email protected] 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...User_ID=119881...

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?

When we had our house built in 1996, I specified a hot water
circulation pump. The plumbing was installed as a loop going to
each location in series and then back to the water heater where it
goes back into the water heater. It works wonderfully, taking only
a second or two for hot water at all locations. We have a wall
switch on the pump, and it is normally off unless someone is going
to wash dishes, take a shower, etc (off when not using hot water).

I highly recommend this system, but am not sure it can be installed
in a pre-existing plumbing system since there is no loop.

Bob-tx

Seems an extra expense for no gain. You are paying to dump cold water
back into the heater to be reheated. That has to cost more than the
same water put down the drain. Then having to turn on the pump and
wait comes to the same thing as just turning ont the water and waiting
for it to get hot.

Leavign the pump on would increase the cost as you would be constantly
reheating the same water.

Harry K