Barrier pipe sizes for long run

[phillskie]

Hi All
Im new to this forum so hello,i have had a 2 story extension built on the side of my house, I have a couple of questions regarding the size of barrier pipe to use. I am running flow/ return/ dhw barrier pipe from the boiler into the loft space and dropping down into the extension, total length of pipe run is approx 14 metres to get to the en suite. Should i run 22mm for the dhw for the majority of the run and then reduce down to 15 or 10mm for the shower/basin.
Is 10mm sufficient for the ensuite hot/cold or should i stick to 15mm?

Cheers

 

[Last Plumber]

When you say " I am running flow/ return/ dhw barrier pipe " do you mean Central Heating flow and return as well as DHW, or do you mean a DHW with a secondary return?

 

[phillskie]

When you say " I am running flow/ return/ dhw barrier pipe " do you mean Central Heating flow and return as well as DHW, or do you mean a DHW with a secondary return?

Hi, yes sorry, Central heating flow/return as well as DHW

 

[Last Plumber]

Hi All
Im new to this forum so hello,i have had a 2 story extension built on the side of my house, I have a couple of questions regarding the size of barrier pipe to use. I am running flow/ return/ dhw barrier pipe from the boiler into the loft space and dropping down into the extension, total length of pipe run is approx 14 metres to get to the en suite. Should i run 22mm for the dhw for the majority of the run and then reduce down to 15 or 10mm for the shower/basin.
Is 10mm sufficient for the ensuite hot/cold or should i stick to 15mm?

Cheers

I would stick to 15mm taken to the point of connection.

What type, make and model of boiler?
What pressure and flow rate you have?

 

[phillskie]

I would stick to 15mm taken to the point of connection.

What type, make and model of boiler?
What pressure and flow rate you have?

Hi ,its a Vaillant Ecotec 837plus flowrate 15.2,