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Suggestion on you preassure tank make sure the it the bladder hasnt been water logged.
The answer you gave was incorrect.....I found the answer to my problem on another website for questions/answers which by the way was totally free.
The answer to the air in the hot water lines was due to the anode rod that came with the water heater. I have a well system and very hard water and have to use alot of salt to soften it, this is what causes the problem (Outgassing). Outgassing happens in all the new water heaters because of the anode rod which is there to protection the tank from corrision and forms some gas at the anode rod and on the walls of the tank. When the water in the tank is very hard and or when having to use alot of salt to soften it the outgassing becomes very rapid and the gas escapes as air from the facuets.The solution to this condition is to replace the anode rod with one that is used up more slowly which will produce the gas at a much slower rate, reducing the air in the hot water lines. I replaced my anode rod with a magnesium anode rod from Rheem, this rod also has a resistor in the top of it to help slow down the action of the rod and in-turn reducing the outgassing. I installed the Rheem (magnesiun rod with the resistor) anode and have not had the problem since (this was about 18 months ago). I added another bed room to my house and had to install an additional water heater for the bathroom. The first thing I did was to replace the anode rod with one of Rheem's magnesium with the resistor and have not had the problem with this water heater (this was almost 12 months ago). Hope this will help others....