Replaced an old 50-gallon gas water heater in Farmington with a Navien NPE-240A2 tankless water heater. The homeowner wanted endless hot water and improved energy efficiency. I removed the old tank, installed new PEX water lines, and connected the unit to a condensing vent system. After programming the recirculation settings, I tested water flow and temperature rise. The system now delivers on-demand hot water with lower standby energy loss.