Extending heating system into new extension

[ifindoubtgiveitaclout]

Hello, can any one give me some information?
I intend to extend my heating system into a new extension .Currently I have a 22mm flow and return going around the house with t offs of 15mm and then down to 10mm to the different rads. Can i just T off the 22mm flow and return and take them into the new extension to feed the new rads after reducing down to 10 mm or will i have to take the flow and return 22mm into extension and return the 22mm back out and join it up again to the flow and return of the original system, so in effect the new part is like a u shape with the various rads being run off it .
I would be grateful for any help.
Thanks

 

[Gasman1015]

No, you don't need to form a loop, just extend the 22mm flow and return into the extension, subject to usual constraints of course.

 

[jobloggs]

You only have to take branches (spurs) off the flow and return pipes into the extension as far as the most distant radiator. You do not need to bring them back again in a loop.

Pipe size will depend on number of new radiators and their sizes. If one or perhaps two you could do this in 15mm. For several 22mm would be needed although you could reduce them to 15mm for the last radiator.

 

[ifindoubtgiveitaclout]

Great, Thanks 4 the info i can go to bed now with out thinking about it

No, you don't need to form a loop, just extend the 22mm flow and return into the extension, subject to usual constraints of course.

 

[ifindoubtgiveitaclout]

Thankyou

You only have to take branches (spurs) off the flow and return pipes into the extension as far as the most distant radiator. You do not need to bring them back again in a loop.

Pipe size will depend on number of new radiators and their sizes. If one or perhaps two you could do this in 15mm. For several 22mm would be needed although you could reduce them to 15mm for the last radiator.