I have 2 X Finnex 500W Titanium heaters, with electronic temp control & Guard. For $56 each, you can't go wrong for the price. Although I have usually used them with apex control, I have also used the 150W version on my nano with just their electronic control, and it stays pretty consistent. I have been running all of these on all my systems now for about 3 years and all of them still work well.
I heard that the Cobalt Neo-Therms are very reliable, however at their price point, you could buy 3-4 of the titaniums for that price.
I really think that the Titanium run by an aquarium controller is the way to go.
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