Is 15mm Sufficient for Flow and Return

[jeff the gasman]

The answer is 7, always 7.

It's easier just not to post than confuse agile with your answers.

15mm will easy do 8 rads in fact at a decent velocity it will do more than double that.

Well I hope you're taking the pizz and if you are not, god help anyone trying to balance it.
If you're not taking the pizz you have gone down in my estimation.
And I will end up being ridiculed for ever and you will have a sore bum!
GET IT ?

 

[Dan Robinson]

and you will have a sore bum!

Are you going to take your sock off then?

 

[jeff the gasman]

Are you going to take your sock off then?

No doubt about it Mr Dan

 

[Biggles..]

Well I hope you're taking the pizz and if you are not, god help anyone trying to balance it.
If you're not taking the pizz you have gone down in my estimation.
And I will end up being ridiculed for ever and you will have a sore bum!
GET IT ?

Would be easier to get the right results balancing a fully loaded 15mm circuit than a 22mm circuit with the same load.

Adams already posted the calc showing it'll do 12 (1kw rads), and that's at the bottom end of the velocity range for heating pipework, remember it's 1-3m/s.