"Michael J. Mahon" wrote:
> > I meant 0.000012 Hz.
> Well *that* makes all the difference!  ;-)

The point of PWM is not for the frequency to be high in any absulute
sense (there is none) but too high for the system in question to follow.
For floor heating a cycle length of about two hours is PWM and it is
what el cheapo wall thermostats with internal feed back enforce.[1] The
cycle length with an overshooting on/off thermostat would be more than
ten hours. If you are faster than the natural cycle by an order of
magnitude, then by definition what you get is PWM.

[1] The valves don't like being switched too often. Ten times higher
frequency means ten times lower life expectancy and would become rather
a nuisance.

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