Customer wanted to replace old 50 gallon gas water heater with new Navien 240A tankless water heater. Mounted tankless on wall with two by fours and ran 2 inch PVC approximately 15 feet through new penetration for correct venting. Also installed condensate pump and ran condensate drain line out existing penetration. Caulked wall penetrations. secured all piping with straps. Also installed Navien recirculating T in furthest fixture in master bath. After install was complete, checked all areas for leaks and checked for proper heating of water in all areas of home. lastly, removed tank water heater.