Unorthodox shower pump ?

[mistersnail]

Hi,
I want to replace an old electric element type shower in my en-suite with a thermostatic valve fed from a shower pump. The problem I have is that it is impossible to get a hot & cold supply from the water heater to the en-suite without major building work. In the en-suite I already have mains cold water and a gravity fed hot water supply. Could I pipe the mains cold directly into one side of the shower valve and use a single ended negative head pump (the shower rose is higher than the hot water header tank) to pump hot water into the other side ?
Thanks.

 

[stem]

You could use one of these. They require mains cold water and stored hot water which is exactly what you have. Don't have any experience of them though so I don't know how good they are.

http://www.newteam.co.uk/projects/cnew001/web/pid.nsf/webpages/ProductsVenturiJetStreamWelcome.htm