Oil filled heaters: 600 watt heaters pretending to be 1500 watts

I love these oil filled space heaters because they are completely quiet.  But every one of them I have tried will trip it's internal overheat thermostat if it's set higher than level "1", which is about 600 watts.
Seeing that leves 2 and 3 are useless and perhaps dangerous, I modified mine to have a 400 watt and 600 watt level, but no higher levels.

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