Megaflo output pipe size

[pjo123]

Hi all, me again

Currently my megaflo 22 mm output goes a roundabout route to my bathroom and is around 12mtrs in length.

Once it gets to the bathroom, it goes down to 15mm and feeds a basin about 1mtr away and a shower about 2 1/2 mtr away (making shower nearly 15mtrs away from megaflo).

I want to take the pipe in a much more direct route which if I T from near the megaflo, will only be about 7 to 8mtrs to the shower mixer.

The megaflo instructions say ideally the output should be in 22mm with short runs in 15mm to taps/showers.

The question is, how long is a short run? If it's possible (as I already have the pipe and fittings) I would like to do the whole 7 to 8mtrs run in 15mm.

It's going into a triton mixer.

Currently, if I turn on a hot tap in the sink or bath (bath being replaced with shower enclosure) the pressure is very high, just like the cold, where if I open the tap too far, it comes out with such force, it goes everywhere.

That being the case, and me no longer having a bath to fill, do you think I could do the whole run in 15mm or would it be better for me to buy a couple of lengths of 22mm and do the first 4 or 5mtr in that?

Many thanks

 

[snb]

tee off in 15mm near to the megaflow and then use the shortest route to the shower.

This will dramatically reduce wasted water

 

[ChrisR]

There would be no point using 22mm, and as snb ~ says it will reduce the amount of water in the pipe which is cold so causes a delay .
It's only really large diameter shower heads which need huge flows.

 

[spin99]

Below your bath and sink taps you may have some tails with valves in them. If so you can reduce you flow by turning these slightly with a screwdriver.