A: You don’t mention which mixing valve you have however with a manual mixer with a pump the pressure on both shower valve inlets should be the same therefore the shower heads “should” have no effect on the temperature.
My two thoughts are check that the filters on the pump inlets are clean (Some debris in the pipe work may have been disturbed when you switched the water on and off) and see if you can borrow some ones shower head to test the problem.
Answered 277 days ago | The Doc
A: You don’t mention which mixing valve you have however with a manual mixer with a pump the pressure on both shower valve inlets should be the same therefore the shower heads “should” have no effect on the temperature.
My two thoughts are check that the filters on the pump inlets are clean (Some debris in the pipe work may have been disturbed when you switched the water on and off) and see if you can borrow some ones shower head to test the problem.
Answered 277 days ago | The doc