Customer stated: they wanted their annual water heater flushed. Tech notes: called out today to perform a water heater flush. While on site I found the 50 gallon natural gas water heater in the garage is way outside manufacturers warranty. I did not perform a flush but perform an inspection on all code required items. I found all code required items to be functioning properly as should. Resolution: completed water heater inspection to find all code required items functioning properly as should. Job status complete.