[csuruki]

Go with the ACT D'mand pump. It is the best out there. Go to www needhotwater com to get more information. It is on-demand so is activated by a button, which makes the pump the most energy efficient system out there. Timers will continuously activate the pump during a set time and most people later find that they don't have a set schedule for hot water need so they turn the pump on for most of the day. Also, many forget to turn off their pump when they go on an extended vacation. Because it's on-demand, it is the only pump that does not void tankless water heater warranties.

The DOE confirmed that it costs on average $1 in electricity to run per year. It is recommended to be installed under the furthest sink from the water heater or wherever hot water is needed most often. Usually, it is the kitchen or master bath. It uses the existing plumbing, but can also be used with a dedicated return line. It is easy to install (unless you need to have an outlet installed under the sink).

There is a remote/transmitter option that is nice if the pump is, for example, downstairs in the kitchen but you are upstairs going to take a shower. Many people like the remote even if it's in their master bath. They can be waking up and hitting the button from bed so by the time they get to the bathroom to shower, the water is hot.

The pump usually cuts down about 2/3 of the wait time to get hot water.