is my thermo shower valve working properly?

[tan8856]

hi

i bought a 'Metro vertical thermostatic shower bath valve' from Bathstore

http://www.bathstore.com/_applicati...-thermostatic-shower-bath-valve-284.html?pg=0

I thought that thermo ones kept the water temp constant. But if someone else uses the sink taps or flushes the loo whilst im in the shower then the water runs very hot. i thought the whole reason for thermo was to avoid this? is it working as it should?

thanks

 

[stem]

In theory you are correct, a thermostatic mixer should sense the temperature and automatically adjust the hot/cold flow to get the required temperature.

However, it will have limits. Obviously it can't provide more cold water than is available to it. There should be a specification with the mixer that gives minimum conditions with regard to flow and pressure. If these minimum conditions are being met, and it's still not performing then it sounds as if it is faulty.

 

[ChrisR]

Are the supplies "balanced" , ie from the same pressure?

 

[tan8856]

Are the supplies "balanced" , ie from the same pressure?

The hot is from a cylinder and the cold from a tank in the roof.

The shower is pumped tho.