If you have air in your tank it is probably from a faulty pressure relief valve. The pressure relief valve is just like the one on a household water heater. Very easy to replace. Turn off the water heater, turn off the pump/city water valve, open the pressure relief valve, unscrew with a wrench, go to hardware store and find replacement(make sure it is the same rating/pressure), get some pipe thread tape/teflon tape, apply pipethread/teflon tape, screw valve back in and tighten with wrench...done.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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