> Heat pumps of course DO allow efficiencies of > 100% :-)

      Not in usual way... If a heating pumps eat 4KW of electric power
    (for a pressure pump) and gaves 2KW of electricity and steam from
    5 Celcius degree water, something is special there.

Not "heating pumps" - "Heat pumps"; like in a refrigerator.  You move heat
from one place to another, using "some" energy, but you get heat output
greater than the power you put in to move the heat...  Nearly always used
for refrigeration and air conditioning (pump heat OUT of the part you want
cold), and sometimes for heating as well (when the difference between the
external temperature and the desired internal temperature is relatively
small.)  IIRC, "efficiency factors" on the order of 4 (4W heat moved for
each watt of power consumed) are pretty common.

BillW

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