Thermostatic shower not getting hot water?
I have a grohe thermostatic shower. The dial ranges from 60 - 110F. When it is at it's hottest setting the water is only warm and never gets hot. If I turn it down, and slowly turn it up it may get hot for 2 seconds and then returns to warm. We have checked
it sounds like the valve has a lot of deposits in it plugging the flow. you might be able to remove it and clean it out.

Provies heating and air conditioning parts like HVAC controls, johnson, belimo, barber colman, invensys, erie, thermostats, actuators, valves.