Electric shower get hot when other taps opened

[dcawkwell]

Electric shower

My sister has a badly plumbed in house so that when
they are using an electric shower if anyone else
in the house uses a tap the pressure can drop and
cause the water in the shower to get quite hot.
I notice the descriptions of quite a lot of the electric
showers quote "manual" temperature control.
So I assume setting the dial on the shower only keeps
to that temperature provided no one else affects the supply of water.

Are there any thermostatic electric showers that will
keep the set temperature if the flow changes a little.

 

[seco services]

Sounds like your mains has a low flow.

Mira have just brought out the new sport range including a thermostatic.