Installed new Rinnai tankless water heater per local code requirements. Verified adequate gas line sizing and venting configuration. Mounted unit level, securing to wall per seismic specifications. Properly connected water lines with service valves, installed approved discharge piping for temperature-pressure relief valve. Established electrical ground, integrated thermostat control wiring. Performed combustion analysis, adjusted gas valve for specified CO levels. Unit operating within designed temperature rise and flow rate.