On Thursday, February 14, 2013 4:43:47 PM UTC, Onetap wrote:
On Thursday, February 14, 2013 8:52:25 AM UTC, harry wrote:

Diagonal connections will give you the maximum heat output. The
manufacturers heat ratings are all for diagonal connections because it
makes them look more efficient.

Diagonal connections are the traditional way radiators are connected.
Using the two bottom connections is just done to make the pipework
look neater. And save a bit of pipe.


TBOE was traditional, but only whilst gravity circulation was in use.
With any pumped system there is very little difference in the flow
rates between TBOE and BBOE.

Not according to Faber & Kell's Heating and Air Conditioning of Buildings:

TBSE = 1.00
TBOE= 0.97 to 0.95
BBOE = 0.78 to 0.84

I am interested to find that TBSE is better than TBOE.

Robert