Tankless water heater- Perform descaling solution flush with pump, check flu connections, check gas connections, check drain connections, check combustion screen and clear, remove sediment trap and clean, remove recirc drain and reinstall, check system for any water leaks, inspect heat exchanger, clean and polish flame sensor and spark ignition system, check interior of unit for water leaks, check wiring is neat and undamaged, reinstall all items and verify operation before leaving, bleed descaling solution out of hot water lines to eliminate smell before leaving. Suggestions: To become a service club member for the tankless water heater maintenance. You get three visits of annual service as well as access to priority emergency services and discounted rates on diagnostics and repairs. ($384) We work on Furnaces, Air Conditioners, and Fireplaces as well with maintenance or repairs if ever needed. Recommend to become club members for all pieces of equipment in the home! Homeowners fi