I recommend Finnex. Mine lasted longer than all my other heaters and was also more powerful even though it was the same wattage. Mine went out due to user error not manufacture problem. It came out of the water and fried otherwise I'd still have it. I love their digital controller for regular use. I don't think it goes up to 100 degrees but it had a loud alarm that goes off if the temp gets too high or too low (you set where you want it to be). After my heater went out I still am using the controller as a thermometer and the alarm goes off even without the heating element attached.
Sorry for butting in on your thread with my question yesterday.