Gday Gama
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You dont need to vary your voltage over a large range,
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True, but the discussion thread started on thermostatically controlled dewheaters ( Not just on/off or manually set )
For this type of controller ( and max efficiency ), you need to be able to vary the output voltage proportional to temp difference.
Straight PWM gives this
If you just want an on/off type, then thermistors feeding a comparator feeding a mosfet is all you need.
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use a variable voltage switching regulator, like this one
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Nice neat unit. Looks like a shrinkwrapped "homemade" special.
I note it still only goes down to 1.2V, so an on/off switch is still required.
Andrew