teeing off existing pipework

[jon3674]

On my current c/h system i have 2 x 22mm copper pipes running from the boiler to supply the radiators, flow and return i presume. Each radiator throughout the house has a 15mm branch off these 22mm pipes to feed the rads. I intend to add an additional rad to the system which is very close to an existing rad. My question is can i tee off from the 15mm pipes running to this rad to feed the new one, or do i have to tee off from the main 22mm pipe like the rest off the rads.

Thanks in advance for any help

 

[namsag]

Should be perfectly ok to tee of the 15mm.

 

[namsag]

OOPS i stuttered.

 

[Fluffster]

For optimum flow and return best tee of the primary 22mm flow and return.
How big is the rad you are attaching? if it is say a small one for a cloakroom you could tee off the 15mm to feed.
Pete

 

[jon3674]

The existing rad which i would like to tee off is approx 4500btus and the rad i want to fit is approx the same size. Getting to the main 22mm pipe run is not a problem, it would just mean taking up more floorboards than intended. Would you say it would be better practise to tee off from the 22mm pipe?

 

[Fluffster]

If you were thirsty would you rather drink from a pint glass or a champagne flute?
Pete

 

[ChrisR]

Ye olde Thumbe rules say up to 14000 on a 15mm pipe. Could be hard to balance if they're the furthest from the pump though.