Hey Sarah,
I think its rated for up to 180gallons, it depends on how much you are trying to lower the temp. I don't have the original manual for it, I did print one off the internet which I should find. From what I can gather it is rated for a 180g with a 10 degree pulldown or 100gallons with a 30 degree pull down. Basically the less you have to drop the temperature, the larger you can go. I had no problems keeping my tank stable at 77-79 during the hottest weather, and who knows what temperatures my tank would have reached without it.
As for the dual controller, I'm pretty sure it has it. Again no manual but there is a plugin on the side for a heater as well as a light on the console for "heat" so I would gather it has that ability to control both.
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Christy's Reef Blog
My 180 Build
Every electronic component is shipped with smoke stored deep inside.... only a real genius can find a way to set it free.
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