Homeowner requested technician flush tankless. Technician found many cold violations with tankless, including back pitch exhaust pipe, improper installation of T And P line, missing thermal expansion tank and improper gas line size. Discuss replacement options and repair options to bring tankless to code. Homeowner did not want to fix or replace at this time. Technician flushed tankless water heater, cleaned inlet filter and air filter. HOMEOWNER UNDERSTANDS THERE IS NO WARRANTY ON TANKLESS FLUSH