Homebrew PCBs

>> Supply it with rectified (and cap. filtered) AC and you get the 
>> necessary
>> "plus" in power for enabling the control loop to work - so you can 
>> still use
>> your 110VAC heater.
>
> Control loop?  Where's the feedback portion of it?
>

either the heater itself or a external small thermistor/thermocouple..

ST