Today, I installed a Navien NPE-240A tankless water heater near Princeton University. The unit's high efficiency and compact size made it ideal for the limited space. I removed the old tank-style heater, then mounted the Navien on an interior wall. I installed new gas lines to accommodate its higher BTU requirements and vented it using PVC pipes. I also set up the condensate drain and connected the unit to the existing water lines. After programming the temperature settings, I tested the system to ensure proper operation and optimal performance.