Water heater repair questions
I am trying to repair my gas water heater since after earthquake the amount of hot water it gives in the shower has come down. As part of it I am trying to replace the flexible copper connection, the stem from the water heater in the attached figure. Based on it I have the following questions
1)What type of part do i get for that stem that comes from the water heater and connects to the flexible copper connection? Does that contain the unions, nipples?
2)In the picture do you see any anode and if not, how is corrosion avoided inside the tank?
3)Since I see a lot of rust in the flexible copper connection, stem. By my me replacing them, do you think the amount of duration of hot water in the shower increases. Earlier before earthquake, I didn't have any issues, but now, the hot water in the shower only lasts for 5 mins and then the heat slowly comes down. If not, please give me other solutions to fix the hot water issue.