Changing standard radiator to vertical. 10mm speedfit big enough?

[delboy9732]

Hi,
Looking to change a large double radiator (1600 x 600) to a double vertical designer one which measures 1800 x 472 with a btu of 10333. Will this be a straight swap (obviously relocating the pipe centres) or does the additional height have an effect on the flow/heat? Thanks in advance for any help.

 

[mfarrow]

There is no noticeable effect.