Dehumidifier [Updated May-2018]

As we have mentioned in some of our posts about living aboard a boat in cooler climates, we run a dehumidifier inside our boat during cooler weather when at the dock and sometimes while at anchor. [We can also fire up our air conditioners (we have 3 separately controlled units built-in.) They take care of excessive moisture quickly.]

In fall 2015, our not so old, heavy duty [and noisy!] workhorse name-brand compressor type dehumidifier quit working. The GFCI outlet it was plugged into was tripped. It immediately tripped upon reset, and did the same to any other GFCI circuit it was plugged into. Therefore it was no longer safe to use...

It also had other issues inherent to that technology. For instance, if the interior temperature of the boat got much below 40°F in that it would frost-up [This would happen if we were away from the boat traveling...] And the electronic controls had to be manually reset after a power outage because it wouldn't automatically start back up when the power was restored. And did I mention how noisy it was?...

Our search for a replacement revealed a new technology that doesn't rely on an air conditioning compressor. It uses a self-recharging desiccant technology [not Koolatron 12 volt cooler technology, which we tried in the past. They frost up quickly and stop removing moisture even though they continue to run after freezing-up...]

This new one is really efficient, very quiet, lightweight and compact [we can actually store this one onboard...] It has an optional drain hose [which we lead to a shower sump] which eliminates manually emptying the built-in tank when it is full. 
Update: As of the last time we updated this page [see title] we still couldn't be more pleased with this model. It just keeps on working... well...
This new unit also puts out a small amount of heat, and has a high setting to facilitate clothes drying; all using far less power than the old compressor style dehumidifier. It also continues to operate normally down to 34°F [per the manufacturer- we haven't tested this yet...]

The normal setting is 330 watts, and clothes drying mode is 615 watts [120V AC] so we can easily run this on our inverter as needed.

After extensive research we bought the model linked below with manual [vs. electronic] controls that allow the unit to resume operating after a power outage. [Didital controls may require you to redo your settings after a power outage... This is important if you leave it running while away from the boat (at the dock) for extended periods as we sometimes do...]

We couldn't be more pleased... [nor drier...]

EcoSeb DD122EA-SIMPLE Desiccant Dehumidifier, 15-Pint, White, 120V


  1. Hey guys!
    Just curious how the EcoSeb is going? We were thinking of replacing our refrigerator sized compressor type for this because of its size and capacity. Also thinking of the smaller Eva Dry 2200 but think it's small removal rate won't be able to keep up in southern hot humidity in our 47' mono. Just curious, hope all is well and you're starting to shake off the winter cold up there!

    s/v Redemption

    1. Hi Ronnie,

      We still love this little dehumidifier 18 months later...

      It kept the boat completely dry and 100% mold free for our 10 month absence while selling our house in Fairbanks last year. [We had 83" of rain during that period...]

      We installed the drain hose to a shower sump and it was flawless. [Draining the dehumidifier into the shower sump allows us to close sink and other through-hulls as it discharges above the waterline...]

      We bought this specific model with the analog controls so it would start up where it left off in the event of a power outage [and it does...] Last I researched, the digital control models reset to generic settings and don't automatically power up after an outage... (In case this is of interest...)

      Cheer! Bill

    2. PS: One of the attributes we really like is hanging our laundry above it and turning it up to the clothes drying setting [high fan...] It takes care of drying everything overnight without any new moisture escaping into the boat... [e.g., windows stay fog free in the winter...]

    3. PPS: Since you mentioned your southern, warmer climate, I wanted to remind you that this desiccant style of dehumidifier keeps the desiccant active by using heat. Therefore, it is discharging a bit of heat into the room instead of cold like the compressor types do...


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