Have had real good luck with Ehiem heaters over the years.
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I eliminated roots clogging my drain by reversing the flow.
I pump the nutrients into the bottom and let the effluent overflow out of the the top. The roots travel down, and never enter the overflow at the top of the waterline. The supply line is always under pressure and the roots never enter there, they just get pushed back out by the flow.
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I like that idea, in the bottom, out the top. I did a final exchange of the heater, now there is a piece of foam keeping the top floating. We have has such bitter cold here I also added a heater blowing on the rez. It’s staying good now.
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