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new hot water heater problem

1511 Views 6 Replies 5 Participants Last post by  bmyer
Hello all. I recently replaced our hot water heater because the old one was leaking. Now, when showering if the toilet is flushed the shower gets very hot. If the sink is turned on the shower gets cold. We didn't have this problem with the old heater. It was a 38 gal and the new is 50 gal. Any idea what could be causing this? The old one was soldered all the way to the water heater and for the new one I used some flex pipe with shark bites on one end and it screws on the other. Not sure if that makes a difference or not. Any help would be appreciated. Thanks.
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Thanks for the reply oh'mike. The shower control is about a 10 year old delta. It has a cup and springs and a ball inside where the newer cartridges would be. I replaced both of those parts, still have the same problem. Is there any way to upgrade this to newer stuff without tearing out the shower? I have no access to the pipes besides the hole in the shower. Thanks.
Thanks for the replys guys. Yes, jagans the cold water valve is all the way on. My neighbor winterizes homes and suggested blowing out the lines. What do you guys think?
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