On Fri, 09 Dec 2005 00:10:44 GMT, "PipeDown"
wrote (with possible editing):

....snip

A simpler recirculation system cross connects the hot and cold lines under
the furthest sink. No power, pump or return lines are needed. The downside
is that you will now need to run the cold water just a little (not as much
as you did the hot) to purge the warm water to get cold. Not an issue when
warming up a shower or if you usually drink bottled water. The upside is
these systems are very inexpensive and can be installed in an hour.

Yahoogle on hot water recirculation and you will soon be overwhelmed by
information.

Any recirculation system will cause an increase in hot water heating charges
(gas or electric) but will substantially reduce the waste of water.
Insulating the hot pipes will make a big difference in the efficiency any of
these systems.

While it is not practical to change your pipes, a smaller pipe for the hot
water (1/2" instead of 3/4") would substantially reduce the volume of water
standing in the pipe which needs to be purged before the hot gets to you.

And yet another solution uses the electric on-demand water heaters
which install just under the sink. Thermostatically controlled, they
only operate until the regular hot water gets to them. The
disadvantage, of course, is the operating cost, but that might not be
an issue if electricity is inexpensive where you live.
--

Larry
Email to rapp at lmr dot com