The girard in our Gemini, I set at 120 degrees, ran an adjustable pressure regulator set to about 53psi, and never had a problem with water temperature, or mixing cold and hot water during a shower or??? From the many posts, it seems the girard might be a bit sensitive to settings and water pressure, but in my experience once set up they work well. BTW, until I put that adjustable pressure regulator on the line, I could never seem to regulate water temperature.
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