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Thanks Bob.

I'm replacing the pressure tank in my mom's house. The well has a submersible pump. Should there be a check valve on the pump or do I need to put one just before the tank? Would it cause problems to put a check valve before the tank anyway? I don't know what is there now and have no way of...

OK, as long as I am going to work on this system, I have another question. The house in question is my moms. If you are in the shower, and somebody uses cold water anywhere in the house, you get some pretty hot water in the shower. What would be a way to solve this problem? Thanks again.

Thanks for the replies. Looks like I had better stick with at least 3/4 copper. I just measured some Pex and 3/4 is not really 3/4 is it. So what does the CST refer to anyway? I should probably try to go with 1", but I've not seen 1" Pex anywhere. Or 1" copper for that matter. Not sure...

I need to replace an electric hot water heater. It is on a farm with a well. The water pressure is never very high. I need to gather all the materials then drive 3 hours to do the replacement. I am not sure of what I will find other than the existing lines are a mix of galv and copper of...