I'm just looking at the heatsink/fan combo they put on these, and compare them to ones rated to cool a 125 watt CPU. They will indeed run much hotter, there just isn't enough heatsink/fan to avoid it. I did get one of the 180 watt rated testers, it has dual fans and heatpipes, it is much more likely to actually last (especially if restricted to 150 watts). I might try replacing the heatsink thermal compound since I have some good stuff, but I just haven't done it yet.
Once it gets to March/April here, I'm not running a heater as a load, an air conditioner, maybe, but certainly not a heater.