Alan Holmes wrote:
"Jodie" wrote in message
...
Have a nice new electrical greenhouse heater. Its set to
automatically start and stop with temperature.
So as to calculate power use and hence cost of greenhouse heating
anyone know of a good inexpensive system of recording the duration
the heater was actually on?

Connect a cheap electric clock in paralell with the heater, then
all
you have to do is read the time!

Or a slightly more expensive electric clock which doesn't mislead you
by starting at 0 every twelve or twenty-four hours! Might be cheaper
to get a meter and wire it in.

Mike.