Two Types of Water Recirculation Systems – Dedicated Loop and Integrated Loop.
1. Dedicated loop system: This type of water recirculation system requires that you attach a circulation pump connected to the bottom of your water heater tank.
The hot water pipe is extended in a loop throughout the home, passing near each appliance and plumbing fixture. Beneath each fixture, the loop is connected to the fixture by a short pipe to the hot water valve. Whenever a valve is opened, it takes only a very short time for hot water to reach the valve because there is always hot water circulating through the hot water loop.
Note: if you are selling your home and the home is unoccupied, you should unplug your pump because you don’t want to pay to operate the system in an empty house.