Customer has a tankless water heater that he wants to utilized the Recirculation pump inside the unit, returned to install the Recirculation loop. Crawled underneath the home and attached a 3/4 pex line from the tankless to two bathrooms, and one laundry room. Bled the system of air an changed the dip switches and three way valve inside the tankless unit. Turned the unit on and the Recirculation loop is working perfectly, went inside the home and tested the fixtures and they are getting hot water within a couple of seconds.