Never wait for hot water again. This thing is easy to install. Maybe 15 minutes. Easy to program. Runs two hours in the morning and three hours in the evening. Sips electricity. Uses about 30 watts, which is your ceiling fan set to ultra-low
The pump hooks up to the top of your water heater, and to the sink furthest from the water heater. It will run on a timer and pump hot water into the pipes using the cold water line as the return line. It also has a temp valve so it does not pump your cold water line with a bunch of hot water.
This means you always have hot water at your sinks. Especially good for those 2+ story homes where the water has to travel a good distance to get to the sink. I now do not have to wait for my hot water to heat up to wash my hands / shower. It is the greatest feeling being able to turn on the water and have it nicely warmed up, not freezing cold when you go to wash your hands.