tldr; Reddit trusts the Aprilaire 600 as a quality bypass whole-house humidifier with 17 GPD capacity, reliable construction, and easy water panel replacement.
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Best praise vs top criticism for Aprilaire 600
โYou need hot air to evaporate water. Installing the 720 on the return side will not provide the hot air needed to humidify. I'd recommend the 600.โ
3 Reddit opinions analyzed โข Last updated 2/24/2026