Install Navion 240 A2 tankless water heater. Installed all code compliant upgrades, including comfort pump, thermal expansion tank, check valve and new ball valve. Install new pressure reducing valve. Set pressure to 50 psi. Heart piped new gas line to tankless water heater. Install installed new gas shut off valve. Checked and tested for leaks. No leaks. Technician will return Friday to install comfort tee. Homeowner needs electrician out there to uninstall electric tankless.