pump for shower. recommendations?

[peavey]

Need to pump the hot water from a gravity fed cylinder in a flat. All cold taps are from the mains so just want to get more pressure to the hot, mainly for a thermostatic shower.

Anyone recommend a good pump for this?

Thanks

 

[seco services]

if your fitting a thermostatic shower i would use even pressures not one off the mains and the other gravity/pump fed.

 

[peavey]

Yes so would I but it isn't going to be practical to unhook the cold outlets in the bathroom from the mains.
So the hot is all I've got to play with.
(I was going to go for an unvented cylinder but the pressure releif requirement has made that impractical).