[hehehaha]

I did an exhaustive search and tried them all. The answer is Vornado Evap40. Can easily dump 2 gallons in half a day. Nothing even comes close. Key is moderate negative air pressure. Operating cost is higher than most but well worth it.

[superseeplus]

If you are sensitive to noise, try the Vornado EVDC lineup. It is smart enough to run the fan at the lowest speed required to maintain the set humidity.

[hehehaha]

I found hygrometers on these machines to be not so accurate. It hardly matters in my use case because even maxed out at 4 gallons per day, it barely keeps up during winter heating months.

[DVassallo]

Why is negative air pressure important?

[Anarch157a]

water evaporates more easily at lower pressures. That's why at very high elevations, you need a pressure cooker to cook most foods properly.