Pipe diameter from tank for thermostatic shower?

[imsparticus]

Hi, my ongoing quest for knowledge continues with my next question.
What pipe diameter would you recommend to feed an unpumped thermostatic shower from a vented hot water cylinder via a new Essex flange? The run is approx 22 meters (up into the loft along and back down), the cylinder is fed via a 28mm cold inlet pipe and the cold water tanks are roughly above (2meter head) where I want to install the shower.

I was thinking of using 28mm but would it take longer to get the hot water that far compared to say 22mm?
All recommendations gratefully received.

Thanks in advance.

 

[dhill]

Id suggest invest in a pump, i piped mine in 15mm plastic. Shower worked fantastic. If your not going to use a pump then 22mm should be fine, careful with essex flange can be tricky, their is other alternatives on the market.

 

[ChrisR]

I'd agree. 2 metres head isn't going to give you an exhillarating showering experience like wot it says in the shower glossy.
I find Essex flanges the simplest, maybe I'm strange.

 

[imsparticus]

I'd agree. 2 metres head isn't going to give you an exhillarating showering experience like wot it says in the shower glossy.
I find Essex flanges the simplest, maybe I'm strange.

We have another shower but closer to the hot water cylinder which gives a good flow etc so if I can match that I'd be happy. Back to the pipe diameter, 22mm or 28mm any other thoughts re the length of run V's diameter?