Ok, dimming and pulse are both forms of proportional control. The difference is how it is done. A dimming thermostat will vary the actual voltage to get to the correct temperature. On a pulse control thermostat, the thermostat will turn the heating device on and off at a very fast rate to control the temp. The pulse will change the amount of time the heat is turned on to get the desired temp, but it does this on and off cycle many times a second which gives you an even and controlled temp.
I hope this somewhat makes sense. If not Google how a dimmer switch works, then Google pulse width modulation. Or another way of thinking about is a sine wave (dimming) vs a digital wave (pulse).
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