"Set Square" wrote in message
...
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!

It is?

The power rating of a boiler

So, power in there somewhere.

is simply the *rate*

Which is time.

at which it can convert the energy
in the gas or oil into heat and
impart it to the circulating water.

Power = Energy x Time. So this energy and the rate (time) sounds like
power.

This is measured in energy per unit
time - whether it be BTU per hour or
kilo-joules per second (better known
as kW).

Which is power.

The only power

Power again.

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!

So, this power is used to change one energy state to another then. Which is
what I said.

I fear taxpayers money was wasted.