Which pipe to take mains water from for Electric shower

[spindona]

Hello

I'd be very obliged if anyone could offer some advice....

I am fitting an electric shower and there are two pipes from which I can take mains water, either the cold water pipe that fills the cold water tank in the loft or the second option is to take if from a pipe which feeds another existing electric shower on the first floor.

It would be easier to go from the pipe feeding the cold water tank, but I am wondering if that will result in lower pressure as the pipe has to go all the way up into the loft and then back down again (hope that makes sense).

I guess in summary I am trying work out which one will have the best pressure.

Thanks for any advice

Sam

 

[ChrisR]

It depends what else those feeds go to but it shouldn't be critical.
Electric showers only take about 4 litres a minute and your mains supply (try the kitchen tap) should provide more like 20.