On Friday, 3 March 2017 17:55:41 UTC, jim wrote:
harry Wrote in message:

I can see you never had an education.

Not in hospital sanitation no.

It's thermodynamics

Any heat not emitted from the radiator is not lost, it is returned to the boiler.
Ergo all radiators are 100% efficient.

Efficiency is a very exact technical term.
https://en.wikipedia.org/wiki/Efficiency

Which profers :-

"
It often specifically comprises the capability of a specific
application of effort to produce a specific outcome with a
minimum amount or quantity of waste, expense, or unnecessary
effort."

that is not the definition of efficiency

In the #real world# (TM) a more efficient radiator

no such animal exists

would shurely
heat the room with less energy wasted on pumping water round the
system,

that isn't wasted

& commensurately less heat lost from pipework to & from
the boiler & rad

that's not lost, it's transferred to the room just the same as a radiator does

by the unnecessary extra cycling & pumping...

the system won't work without pumping. More or less all boilers won't work without cycling, though one could theoretically design one that does, at greater cost.


" Efficiency, of course, refers to very different inputs and
outputs in different fields and industries"

Indeed ;-)

And in the case of radiators, the input is heat in the water and the output to the room is heat too. There is no conversion process, no other inputs or outputs, and no loss.


NT