On 06/05/2021 14:47, Tim Streater wrote:
On 06 May 2021 at 13:35:57 BST, Andrew
wrote:

On 06/05/2021 13:10, Fredxx wrote:
On 06/05/2021 12:55, jon wrote:

What is this nonsense, heat is dissipated by radiation, convection or
conduction so how come efficiency becomes a problem.

For conventional central heating radiators most heat-loss is through
convection. Air is a poor conductor.

It seems there is less overall air flow for a tall radiator than long
for a radiator with the same area and construction.

So hardly nonsense.

Try telling that to the female who has decided that "we need" vertical
designer rads.

Bugger the designer aspect. It all depends on available wall space. A tall rad
of a given width should put out more heat than a shorter one.

Yes, but not in proportion to it's height.