Hard to set good Temperature shower

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Plumber69

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This is the old one, I replaced it with a new one, (waltec) Issue with both is its really hard to set a good temperature out of the shower. I turn the hot on, and barely turn the cold on (1/16 of a turn) to get a good temp. Thing is the slightest adjustment to the cold will change the temp quite a bit. What could be the issue
 

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Jadnashua

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There's only one pipe to the shower riser...the head doesn't know hot from cold as it's mixed in the pipe before it.

What is the volume out of the shower if you just go cold versus hot alone?
 

Jadnashua

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Just unscrew the shower head. Try all cold, check the volume. Try all hot, check the volume. Then, try it with both full on. Note the differences, and get back.
 
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