On gas line going up to tankless install sediment traps to bring up to code. Customer stated that gas company came out and flagged tankless water heaters because they didn’t have sediment trap on gas line. Shut gas off at shut off valve and installed sediment trap at both tankless. Turn gas back on and tested and found no gas leaks at this time. Ran water throughout the house and everywhere is getting hot water. Tested for gas leaks again and no leaks were present. Cleaned up work area.