Quote Originally Posted by Jon Wehrenberg View Post
Fred,

A few comments. The accumulator tank has multiple purposes. As you now realize one of its purposes is to give a good steady flow to the Headhunter. But it also acts to relieve the expansion of water in the HW tank. Water expands when heated and unless it has somewhere to go it goes out the pressure relief. When the bladder is unpressurized as yours was the accumulator tank was merely water without an air cushion to handle that expansion.
Thanks. I never thought of that. I see clearly now that an accumulator with no charge pressure could possibly cause the water heater to swell. Good catch! Its amazing as well to consider how well the grey poly tubing holds up under pressure.

I don't know why my city water is so weak but now that the accumulator is charged, I have to agree that city water isn't very useful. On my coach, one cannot actuate the Tank Fill relay from inside the coach. Therefore, it might be handy to use city pressure since there is a Dump switch on the dash. This might be good, perhaps, for someone staying for an extended period in one spot.