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Old 10-06-2015, 05:34 PM   #41
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We have used dehumifiers on our boats for a long time. We are in a slip with shore power so it is easy. Keep the interior of the boat dry. They have a strong fan so if you put it in the main saloon or galley it will circulate air pretty well. We also have two of those circular Air-Dry fans that we keep in the forward and aft cabins for more circulation and just a very small amount of heat. It works great, keep the interior of the boat extremely dry.

Again, the interior volume of my 40' boat is a lot smaller than most of yours, but it should work well.
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Old 10-06-2015, 06:11 PM   #42
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Heating the ER can drop the relative humidity, but if you're not comfortable with ER heaters, a fan to keep the air moving will help in reducing the condensation.

We use an electric oil-filled radiator style heater on a timer. It cycles ON/OFF to keep the ER temp in the 60 degree range. No exposed heating elements, no fans, no noise.

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Old 10-06-2015, 08:34 PM   #43
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We have used a heater similar to Fly Wright. Works well but when we store at a marina in a cover slip, they will not permit a heater. We've also used an Eva-Dri dehumidifier which works well, until the temp drops below freezing. A fan does circulate the air in the saloon, it doesn't freeze.
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Old 12-31-2015, 04:56 PM   #44
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Santa brought me an Eva-Dri EDV-2200 for the boat. Will be adding a drain hose before taking it to the boat. Thanks for the great suggestions here. No more Dri-Z-Air calcium chloride pots for me!!
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Old 12-31-2015, 06:02 PM   #45
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You'll like it Al. I used a piece of aquarium air hose for the drain on mine. I just drilled a hole in the tank a little smaller than the OD of the hose, shoved the hose in and it's worked well ever since. No sealant or fittings needed.
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Old 12-31-2015, 06:24 PM   #46
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Thanks, HC! I bought a valve with the intent to tap a hole and thread it in but after bringing it home, it seemed more complicated than needed. I like your idea of a simple, snug fit. I have 1/4 in OD hose. If I need to plug it, a 1/4 in plug would be a simple solution.
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Old 01-01-2016, 07:02 AM   #47
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Many marinas now have electric meters , and monthly bills for service.

Those that do not soon will as electric costs are being driven up 300% by edict.

A solar vent or good natural venting might save $3,00 - $10.00 a day .
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Old 01-01-2016, 09:47 AM   #48
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Many marinas now have electric meters , and monthly bills for service.

Those that do not soon will as electric costs are being driven up 300% by edict.

A solar vent or good natural venting might save $3,00 - $10.00 a day .
What's nice about the Eva-Dry 2200 is it's low power consumption. It has a 120 ac to 12 vdc power adapter and draws 6 amps at 12 vdc.
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Old 01-01-2016, 12:11 PM   #49
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Any reason why the Eva-Dri-2200 was selected rather than the smaller 500--can get a package of 5 of them and spread them around.

I don't see a lot of (any) technical info but says no wires, cords or batteries. Assume this is a container of some sort of crystals and the 2200 requires a power source.

https://www.eva-dry.com/special-offers/
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Old 01-01-2016, 02:24 PM   #50
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Ktdtx, I tried using the chemical moisture absorbers and found they need to be emptied often and the chemical replaced. The little electric dehumidifiers, with a drain installed, can be ignored for months and they just keep working.
They don't last forever. I've had the fan go bad on one and the hot/cold thing go bad on another. I still like them much better than the chemical absorbers.
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Old 01-01-2016, 05:57 PM   #51
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I've have used one just like it for at least 15 years and it is a great reliable refrigeration machine! Unfortunately, they are no longer manufactured...
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Old 01-09-2016, 12:00 PM   #52
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I just bought a GE 30pint/day unit for my boat from Lowes. I've been living on my boat while I am building a new house and the winter conditions make for a humidity disaster. This little unit really works well and is quiet. In the summer, humidity is not a problem due to AC's being on. In the winter boat is kept closed up and heat does not remove moisture. Sometimes I would have to open up the boat in the cold just to get an air exchange.

Now after a shower just hang up the towel in the boat. In the morning it is DRY!!!

I'm so happy.
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Old 01-10-2016, 05:37 PM   #53
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Do you drain that to the sink or somewhere?

My boat is feeling really humid lately also. I have a little Eva Dry draining to the sink but it's not keeping up I guess.
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Old 01-10-2016, 05:48 PM   #54
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Those that do not soon will as electric costs are being driven up 300% by edict.
What edict and where?
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Old 01-10-2016, 06:44 PM   #55
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Do you drain that to the sink or somewhere?

My boat is feeling really humid lately also. I have a little Eva Dry draining to the sink but it's not keeping up I guess.

I have two of the small Eva Dry. One in the galley which gets the salon and one in the head which gets the head & V berth.
They both use a short length of hose to drain into the sinks.

If your boat is still too humid then one may simply not be enough.

You likely also need some fans to force circulation of the humid air past the Evas.

They do work but if the boat is larger than mine, 32, and the air is high humidity then one small one may simply not be enough. I also use a myriad of fans to force air circulation. Otherwise high humidity areas will remain as I've seen.

One large dehumidifier may work as well BUT WILL need some fans to force circulation so moister areas can be cleared.
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Old 01-10-2016, 06:55 PM   #56
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I have two of the small Eva Dry. One in the galley which gets the salon and one in the head which gets the head & V berth.

They both use a short length of hose to drain into the sinks.



If your boat is still too humid then one may simply not be enough.



You likely also need some fans to force circulation of the humid air past the Evas.



They do work but if the boat is larger than mine, 32, and the air is high humidity then one small one may simply not be enough. I also use a myriad of fans to force air circulation. Otherwise high humidity areas will remain as I've seen.



One large dehumidifier may work as well BUT WILL need some fans to force circulation so moister areas can be cleared.

Mine is 41' but not lots of interior space, but I think I still might add another one in the head and drain it into the sink.

What kind of fan do you use to circulate the air?
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Old 01-10-2016, 07:26 PM   #57
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Using a dehumidifier

A couple of things.
1) I have a water in my bilge
2) I have a full custom cover that covers my boat. It is dark blue, so even in
January when it is 0 degrees centigrade outside, as long as it is sunny it can be 13 degrees centigrade under the cover on the boat. Inside the cabin it can be 6 degrees centigrade.
Of course, when the sun goes down, and it is 0 degrees centigrade or colder, it will be freezing outside the boat under the cover and inside the boat.
3) I have 3 Camfro air circulating units
4) I presently don't have a humidifier

Question.
Will water in the bilge negate the benefits of having a humidifier? Should I tighten up my stuffing box in the winter to prevent any water from entering the bilge when I use a humidifier?
If I leave the windows open, would the effect of the hot temperature on deck under the cover essentially dry out the boat and have the same effect as an humidifier.

If I got a humidifier during the winter layup period would be of any benefit?
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Old 01-10-2016, 08:26 PM   #58
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I use small muffin fans. The case size is 90mm. They each draw about 10 watts at 120V. I buy them from Newark Electronics by internet. Almost all are ball bearing, not the sleeve bearing units. I do have some sleeve type but they have given me trouble.
I place several of them around the boat. Actually the last time I counted there were 17 total.
4 in the salon, 4 in the v berth, each set up to force a circular travel of the air.
2 in the head, one pointing in and the other out the propped open door.
The flow is arranged so that circulation goes past the Evas.
1 blows out of the V berth. 2 in the engine compartment, 2 in the lazarette all again circulating the air.
1 pulls air out of the bilge area in the v berth as it is quite enclosed and gets water into it from the chain locker.
This way the odds of localized stagnant, high humidity air is minimized..
2 are mounted in the salon windows, one port, one stbd., so they blow OUTWARDs.

It took me more than one winter to set this all up as some of the fans and placements were reactions to specific problems due to humidity.

The EVAs are on a timer set to run twice daily for ~ 3 hours each time. Not much point at night as they can freeze.

I also use several low wattage heaters each on a T.stat so they only come on when the temp. heads for freezing.

My boat is also under a full custom cover/tent which was made for it so although some rainwater gets in, the boat is protected. Just not perfectly.

Part of the reason for all the fans is when we came home from our winter travels there was a faint dampness odour, sometimes stronger than I liked. I was not happy. With all the fans that odour is gone.

A wet bilge will not help as that water is a source of constant vapour. Either adjust the stuffing box to cut water way down or figure out a way to keep the level way down. I don't recommend cranking on the stuffing box as the next spring at recommissioning time loosening the nuts will NOT loosen the packing and then may be too tight. Just adjust so the absolute, acceptable minimum drips through.

I'm home this year, no travel, but normally what I have done above takes care of things for me. Of course the boat is fully winterized on top of my fancination. I just don't want that odour or the resulting mildew spots.

If you are able to monitor the boat frequently during the winter then a lot of this may not be required. Before we started travelling I would go and open the boat two or three times weekly and work in the cold, letting the breeze blow through. Cannot do that and don't like that so much anymore.

As for the question about the dehumidifiers, YES, they will help but they cannot fix a leakage problem. Reduce humidity driven damage, yes, but not fix it if there is a lot of water entering.

I know quite a few folk who use them, larger than mine, and now swear by them. Odour gone or reduced and mildew reduced/gone.

Sorry for the tome.
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Old 01-11-2016, 04:50 AM   #59
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What's nice about the Eva-Dry 2200 is it's low power consumption. It has a 120 ac to 12 vdc power adapter and draws 6 amps at 12 vdc.
I selected the Eva-Dry 2200 because it operates on 110v North American, 220v European and both 50/60 hertz. Hard to find a dehumidifier that accepts the different power supplies of boat yards in various parts of the world.
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