"1. How much energy you will waste keeping the water in those pipes
warm
all the time. Do the calculations for the additional heat loss from all

that uninsulated piping (For almost all of 24 hours every day.) and
you'll be shocked, just shocked, at the number of BTUs that adds up to,

all of which has to be supplied by whatever energy source you are
paying
for to fuel your water heater.

2. If you want to draw a glass of "cold water", you'll have to run (and

waste) water while you wait for the warm water to empty out of the cold

water pipes.

3. 80 degree F water is likely gonna feel too cold to step under in a
shower, you'll still have to wait a while for the hotter water to reach

the shower. And, if you decide to try and shorten that wait by
adjusting
the user adjustable set point higher in temperature you'll waste even
more energy every day.

IMHO the device seems like a poor solution for a minor nuisance
problem. "


All good points. Some of the claims made on the site are dubious at
best. Like that it saves energy. I would think it would actually use
more energy because as you pointed out, you now have a long pipeline of
hot water constantly circulating. I've seen other devices that I
believe would be better. Those devices are similar, but use a small
pump that is actuated by a push button or timer control to circulate
the water. That way it;s only circulated when called for or at certain
times of the day when you are likely to want hot water, ie early
morning or evenings. And by using a pump, they claim the hot water is
moved around faster than it would take by opening a faucet.