Whats the difference between standard and thermostatic valve? Can the hand shower and shower head be on at the same time

The thermostatic shower valve can blend hot water with cold water to ensure constant, safe shower outlet temperatures and prevent user from scalding while the standard valve doesn\'t feature scald prevention. And scald-prevention is a must feature in certain districts. If you are not sure about this, you may make a confirmation with your plumber. Besides, for the standard shower valve, the large handle is the main control handle, it controls water temperature by turning left/right and water volume by turning up/down. The small knob is diverter, which controls water running out from the rain head or hand held shower. When you turn it to a certain position, you can use the shower head and hand shower at the same time or independently. For the thermostatic shower valve, the bottom knob is the thermostatic control, after setting a desired temperature, normally you don\'t need to adjust it in daily use. The top knob controls water volume and also on/off. At the middle, it is off. When turning left, one function (i e. rain head) is on, the more left, the larger water flow. When turning right, the other function (i e.hand held shower) is on, the more right, the larger water flow, so in this case you can only use one function at a time.