Hi, I'm redesigning my central heating, changing from an old oil boiler to
gas and installing a new HWT.

Currently, the boiler is at one end of my long end semi. The pipes split
next to the boiler, one set going upstairs and travelling to the front of
the house to serve the upstairs rads, and the same downstairs.

I would like to move the HWT to the landing in the middle of the house
with the boiler above it in the attic (changing to fully pumped).

My question is;
With this arrangement the pipe from the boiler will split for upstairs
and downstairs rads, but instead of being a straight run they will both
have T-pieces near the boiler for the pipes runs to the rads at the front
and rear of the house. Will this work and be efficient.

Thank you,

Neil