On Thursday, 12 December 2019 16:42:19 UTC, R D S wrote:

It would be advantageous if I could connect up a rad with the flow and
return on the same side (top and bottom).

I get that best case scenario it will take longer to heat up, will it
take a lot longer? Will it fully heat up all?

That'll work fine. Hot in at the top would maximise heating, better than the usual bottom entries. Conventional rads largely depend on gravity for internal circulation, you're helping that along here.


NT