Training and Stuck constantly, help me lol.

[PlumbingKizzle]

I have always been advised that the DHW start 22mm to the bathroom and branches 15mm to all other outlets, confused as the boiler I have just looked at (duotec40he) only has a 15mm DHW feed. Q. does this need to be connected straight to 22mm or can it remain 15mm?

 

[Dan]

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[newbie1]

think you are getting confused
on a combi the flow and return are 22mm the dhw outlet is 15mm
on a system boiler the tank is 22mm and then will tee off in 15 to the sink taps but stay in 22 for bath etc
are you on a training course??

 

[fuzzy]

ften books qill tell you the hot and cold should be in 22mm, in real terms they are normally 15mm

 

[Unregistered]

My confussion lay in the DHW from the combi, as it starts 15mm can this remain for the entire DHW circuit?

I am due to start a course very soon but in the meantime trying to swot up and get a little jump start - dont like jumping in cold footed lol