Dehumidifier in wet/rain PNW? - Page 5 - SailNet Community
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post #41 of 46 Old 01-07-2013
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Re: Dehumidifier in wet/rain PNW?

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Originally Posted by Philzy3985 View Post
... I keep two small electric (west marine brand) dehumidifiers running full time....
I find that calling small heaters dehumidifiers is blatant false advertising. I can't respect that.

From Websters:
Definition of DEHUMIDIFY
: to remove moisture from (as air)

While they reduce relative humidity by changing the temperature, they do not remove any water. They should call them what they are.

You can by an actual small dehumidifier for less.

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post #42 of 46 Old 01-07-2013
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Re: Dehumidifier in wet/rain PNW?

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Seems like you would need multiple units for a boat of any size.
I believe they are 20 pint units. They are small because they have no tank (drain to sink or other). Unless your boat leaks, that should be more than enough for crew contribution and some cooking.

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post #43 of 46 Old 01-07-2013
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Re: Dehumidifier in wet/rain PNW?

..Guess I feel ripped off then. When I walk into a boat store and ask to see their dehumidifiers and they sell me heaters that suck in air, "dry" it, and blow it out. Shucks. Gift card money poorly used.

I have a couple of the "No Damp" buckets, they get moisture that's for sure. The warning label about it tipping over is a little scary.

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post #44 of 46 Old 01-07-2013
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Re: Dehumidifier in wet/rain PNW?

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Originally Posted by Philzy3985 View Post
..Guess I feel ripped off then. When I walk into a boat store and ask to see their dehumidifiers and they sell me heaters that suck in air, "dry" it, and blow it out. Shucks. Gift card money poorly used.

I have a couple of the "No Damp" buckets, they get moisture that's for sure. The warning label about it tipping over is a little scary.

There ARE small dehumidifiers.. they use peltier cells to cool a plate, the air is blown across the plate, moisture condenses and 'drier' air exhausts. A small, inefficient refrigeration dryer. If your unit has a reservoir that you need to empty periodically it is a dehumidifier. If it just warms the air then, well, it's not. The reality of course is that warmer air will hold/keep more moisture suspended in it...

We are using a Sears unit with a 20 pint reservoir. It's about 20" tall, weighs about 15 lbs or so.. maybe more. It goes in the car while we're sailing, but lives aboard exc for summer.

One other thing.. ours will restart after a power failure on its own.. some won't.

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post #45 of 46 Old 01-07-2013 Thread Starter
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Re: Dehumidifier in wet/rain PNW?

I just want to clarify, when I (the original poster) mentioned a 'small dehumidifier' I am talking about something like this:
Amazon.com: Eva-dry Electric Petite Dehumidifier: Health & Personal Care Amazon.com: Eva-dry Electric Petite Dehumidifier: Health & Personal Care



And when I (the OP) am talking about a 'large dehumidifier' I am talking about something like this http://www.homedepot.com/Appliances-...1#.UOuk3ndeCpZ

I think I know what you are talking about pdgaltair and Philzy3985 - is it something like this? WEST MARINE Air Dryer with Fan, Dehumidifier at West Marine Because we almost got something like this used off of craigslist but then speaking with the person and looking over the product specifications - it is a little heater IMHO, NOT a dehumidifier.

Last edited by SV Glossa; 01-07-2013 at 11:47 PM. Reason: added more
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post #46 of 46 Old 01-18-2013
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Re: Dehumidifier in wet/rain PNW?

Has anyone tried a desiccant wheel based dehumidifier? I came across this page about one and it seems like a good fit for my boat, since it works in cold temperatures. I don't live aboard or heat my boat. So in the winter it's going to be 45-35 degrees inside most of the time.

Typically dehumidifiers use a cold plate, cooled by either a peltier element in the tiny 1pt ones and a compressor in the large ones. The air is cooled on the plate and some water condenses out to drip down into the bucket.

If the air is already cold, then the cold plate can't cool it as much and thus is less effective. The cold plate can also ice up. Most compressor dehumidifiers list a minimum operating temperature of 42F for this reason.

A desiccant wheel dehumidifier blows the air through a desiccant, then the desiccant is heated in an area where the water will be captured. They can also work down to just above freezing and continue to work in cold temperatures.

Without a compressor they are also lighter and quieter, but use more power for the heater.

There seems to be a few modules sold in Europe, like the one in the link above, but I can't find them for sale in the US. The only one I can find for sale here is the SPT SD-014V

Compared to the typical 30pt compressor models it's lighter, 18# vs 31# and works down to 33.8 degrees vs 41. But it uses more power and is only rated at 12pt/day instead of 30. Of course it's less than 41 degrees on my boat now so a compressor model would be doing 0 pt.

I can't find any reviews for this thing. Anyone used one? Or another like it? Are their hidden problems, like the desiccant fills with salt and stops working when used on a boat in salt water, or they use way too much power for how much water they can extract?
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