Thermostatic shower - bend vs elbow - real impact on flow rate

[OldKettle]

Hi,
I am currently working on the pipework which will feed a thermostatic shower. This one to be exact:

Mira Honesty Exposed Rigid Diverter (ERD) Mixer Shower | Wickes.co.uk

Mira Honesty Exposed Rigid Diverter (ERD) Mixer Shower

www.wickes.co.uk

I am going to batten and plasterboard the wall, and want to minimise the gap and also avoid chasing, if possible.

I reckon that the minimum bend length in a 15mm pipe is about is 60mm, including the thickness of the vertical pipe, but not including any standoff from the wall.

An elbow would shorten that significantly, but what will be the real impact on flow rate?

Hot water is from a combi, and the cold pressure seems decent, but I haven't measured it. Bathroom is on the first floor.

Any thoughts would be much appreciated.

 

[Dereekoo]

Zilch

 

[oldbutnotdead]

You can buy swept bends if you want to keep it elegant.

 

[OldKettle]

You can buy swept bends if you want to keep it elegant.

Thanks.

This kind of thing?

Amazon.co.uk

Any idea what the bend distance would be compared to a pipe bender?

 

[oldbutnotdead]

Yeah that's the sort of thing. Not sure I have any 15s in the bits box to measure but they are a tighter radius.

 

[OldKettle]

Yeah that's the sort of thing. Not sure I have any 15s in the bits box to measure but they are a tighter radius.

Thanks for the help with this.

Just wanted to note that I finally got the swept bends and they measure exactly 40mm. Might be helpful for others in future.