Bath mixer or immersion heater

[Gusterado]

Hi
Bath mixer tap is running too hot in shower, almost scalding.
Other taps seem mostly good temperature. However there is immersion heater in flat.
How do I differentiate whether element stat or mixer tap is failing.

 

[PlumbBobBob]

is the tap thermostatic? what temperature is the thermostat set to on the cylinder? oh and welcome to the forums

 

[jtsplumbing]

Photo of tap would be helpful ?????????

 

[Gusterado]

Bath is not thermostatic mixer. Cylinder temp is set ad normal as far as I can see.

 

[Riley]

I would say if all other outlets are fine then there is a fault with the tap maybe a restriction on the cold side not allowing a decent mix