Cold mains supply to a mixer power shower??

[ECRyder]

I live in a bungalow and want to install a power shower with the hot supply only pumped separately, and with cold supply to the mixer valve coming from the rising mains (rather than from a cold storage tank). Can I do it and does it work??
Thank you

[plumbbob]

Can I do it and does it work??

Very few models of mixer shower will allow unbalanced feed pressures. Personally, I avoid them anyway because of the increased risk of scalding.

There are several other negative reasons for not using unbalanced feeds so avoid it if at all possible.

[Dick Puller]

You could use an equalizer for this, but as said it's not wise to supply a shower valve with unbalanced pressures or flow rates.