Central heating loop, 1 or 2 ?

[Forest Grump]

Hi, haven't posted here in ages.
The shell of my new extension is almost built so I am currently thinking of plumbing, electrics etc etc.
My existing boiler is in part of the new extension (utility room), and the loop (don't know if this is the correct term), enters the house at this point. What I would like to know is, can I simply put a 'T' onto the 2 outlets from the boiler and create 2 loops or will I have to extend the existing loop.
Thanks.

 

[gas4you]

It will depend on the type of boiler and system you already have. What are the details?

 

[Forest Grump]

It is a combi boiler

 

[gas4you]

In that case it is a yes to your original question.