Thermostatic mixer supply

[dan stevens]

I want to install a new thermostatic mixer shower, and add a pump due to the hopeless pressure. Now, I've gathered that a thermostatic mixer doesn't have to have dedicated hot/cold feeds, because it's thermostatic. And due to the tight layout of my flat and the inconvenience of fitting a pipe from the hot water cylinder, it would be ideal to just use a branch pipe from the exisitng pipework.
Thing is, every fitting diagram for a pump I've seen requires a dedicated feed from the cold water cistern and the hot water cylinder.
Is this actually necessary, or can I fit the pump into the existing hot/cold pipes - probably at the bath taps?
Cheers
Dan

 

[kevplumb]

not if the cold is mains fed

 

[dan stevens]

The cold isn't mains fed - it's from the cistern. So it would be alright to take the pump's hot and cold supply from the tap pipes?
Cheers
D

 

[kevplumb]

dont see why not as long as the bath and shower aint in use together

strictly speaking you shouldnt but