In an earlier contribution to this discussion,
Doctor Drivel wrote:


A boiler: The output is in "power". Yet the boiler just converts one
energy state (oil) into another (heat). Yet the output is rated in
"power". It takes power to do the state conversion.

Yet another travesty of the facts! The power rating of a boiler is simply
the *rate* at which it can convert the energy in the gas or oil into heat
and impart it to the circulating water. This is measured in energy per unit
time - whether it be BTU per hour or kilo-joules per second (better known as
kW).

The only power used to do the conversion is that due to the *inefficiency*
of the process - so if a boiler is (say) 90% efficient, 10% of the energy in
the fuel ends up heating the neighbourhood or whatever rather than your
house!
--
Cheers,
Set Square
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