Flow and Return Pipe Query When Installing new Central Heating System

[Ktm640]

Hi,

I am in the process of installing a new central heating system and have a question regarding the flow and return pipes.

Our house has solid floors downstairs so both the upstairs and downstairs radiators will be supplied from 22mm pipes routed between the upstairs floorboards and downstairs ceiling.

My question is, can I supply both upstairs and downstairs radiators from the same flow and return pipes or do I have to split upstairs and downstairs into 2 zones?

Thanks in advance.

[lets have a look]

yes,the general rule is 22mm then reduce to 15mm which can feed 3 radiators