The trough heaters from tsc are thermostacly controled they have an internal that's set at bout 34 degrees.. I have used them for years.. The thermal pond 100 watt is good for small ponds only.. They also have a problem of actually leaking.. The seals on the float go bad n start to fill w water, I've had many that has done this.. The only time I suggest a heater that is 1000-1500 watts is if the pond is a large one usually 2500 gallons and up.. But this also in my area.. Farther north I probably would suggest one of that size due to the ice thickness you get..
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