How new? I bought my Teco T-30 about 18 months ago for my <500 gallon system. I could have gotten away with the T-20, but other than buying more than I need, I have no complaints.
I guess mine is an old design. If it means anything, I like the built in heater, and it does a great job of cooling my system. I can only guess that the new ones are better, or at least as good.
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