I Am a fan of the Visitherm Stealths as well....No light to look at and very easy to hide in verticle or horizontal positions. I can't express how accurate these are as well. Another great heater is the Rena Cal excel heaters, I use both of these and will never use anything else.
I have used all glass and hydor theos and have had the worst luck with both. They are both under rated as far as wattage very inaccurate and eventually get stuck on. This is my experience on the heaters mentioned. Oh I forgot to mention the Marineland Neptune is also a very good heater but it is green and stands out.
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