Gas company came out and shut off old tankless because of gas leak on gas inlet valve. Homeowner PRV leaking.Homeowner decided to replace tankless and PRV. Technician installed Navien 240 A2 tankless water heater. Installed all code compliant upgrades. Installed new PRV. Set PRV to 65 psi. Checked and tested for leaks. Homeowner had hot water when technician left.