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Problems with a thermostatic mixing valve in a steam shower

CDHE
CDHE Member Posts: 12

I've installed a Kingston Brass shower valve in a client's steam shower. He leaves it set at 100 degrees, and thermometer readings show that it hold within a couple of degrees of that setting.

Our problem is that after running the steamer, shower temperature is up around 112-115. Hoping for some insight why this might be happening.

Thanks in advance!