Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-06-2023, 11:44 AM   #1
Senior Member
 
Osprey69's Avatar
 
City: Florida/Bahamas
Vessel Name: Rogue
Vessel Model: Gulfstar 49 MY
Join Date: Jan 2021
Posts: 291
Dehumidifier...

The Admiral is convinced we need a dehumidifier on-board. I can understand one running whilst away, but when we are onboard either the windows are open, the A/C is on or we have the heat going so its either in-effective or redundant.

Thoughts?
Osprey69 is offline   Reply With Quote
Old 02-06-2023, 11:49 AM   #2
Senior Member
 
City: Juneau
Vessel Name: Sea Dog
Vessel Model: DeFever 49 Raised Pilothouse
Join Date: Aug 2021
Posts: 154
I leave one running in the galley sink when the boat is tied up in the winter but put it away in the summer. They draw quite a bit of power.
SeaDogAK is offline   Reply With Quote
Old 02-06-2023, 11:50 AM   #3
TF Site Team
 
Shrew's Avatar
 
City: Westerly, RI
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 3,823
Running a dehumidifier with the windows open would about as effective as running either A/C or heat with the windows open. That makes no sense.

An A/C IS a dehumidifier.

Forced hot air does a pretty darn good job of drying the air as well.

We only ever used a dehumidifier when the boat was closed and no A/C or heat running, which is typically when we were away for several days.
__________________
Shrew
/SHro͞o/
noun
1. A small insectivorous mammal resembling a mouse, with a long pointed snout and tiny eyes.
Shrew is offline   Reply With Quote
Old 02-06-2023, 11:51 AM   #4
Senior Member
 
PhilPB's Avatar
 
City: West Palm Beach
Vessel Name: Sun Dog
Vessel Model: Mainship 34
Join Date: Oct 2021
Posts: 158
Quote:
Originally Posted by Osprey69 View Post
The Admiral is convinced we need a dehumidifier on-board. I can understand one running whilst away, but when we are onboard either the windows are open, the A/C is on or we have the heat going so its either in-effective or redundant.

Thoughts?

Our dehumidifier is on while boat is in slip and we are not aboard. When we are on board the a/c is running and don't have the need to run the dehumidifier as well.
__________________
Phil
Sun Dog
1983 Mainship 34
PhilPB is offline   Reply With Quote
Old 02-06-2023, 12:11 PM   #5
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 2,719
I have a built in ducted dehumidifier and we run in a lot while on board. However that is in the PNW where it is cool and moist. The dehumidifier adds a small amount of heat and removes the moisture. In Florida, where either the AC will be running or the windows open, a dehumidifier will do nothing except consume power. Still good when you are away from the boat as it uses less energy to dehumidify than the AC.
DDW is offline   Reply With Quote
Old 02-06-2023, 12:19 PM   #6
Senior Member
 
City: Juneau
Vessel Name: Sea Dog
Vessel Model: DeFever 49 Raised Pilothouse
Join Date: Aug 2021
Posts: 154
I just hope this doesn’t turn into another salty air thread.
SeaDogAK is offline   Reply With Quote
Old 02-06-2023, 02:19 PM   #7
Guru
 
City: Olympia
Vessel Name: Rendezvous
Vessel Model: Blue water 40
Join Date: Aug 2021
Posts: 891
Quote:
Originally Posted by SeaDogAK View Post
I just hope this doesnít turn into another salty air thread.
lol, i remember that one.
Bmarler is offline   Reply With Quote
Old 02-06-2023, 02:58 PM   #8
Senior Member
 
Osprey69's Avatar
 
City: Florida/Bahamas
Vessel Name: Rogue
Vessel Model: Gulfstar 49 MY
Join Date: Jan 2021
Posts: 291
Yup. Your conclusions are my conclusions. Thanks Now I must (hopefully) transfer those thermo-dynamic conclusions effectively.

And about that salty air...
Osprey69 is offline   Reply With Quote
Old 02-08-2023, 01:38 AM   #9
Veteran Member
 
NWboater2's Avatar
 
City: Tacoma
Join Date: Apr 2021
Posts: 69
Dehumidifier is one of the first things we got for new to us GB 42 in Puget Sound.
Eva dry desiccant, drains to sink. Works in lower temps than compressor types, they say. Runs on “auto” all the time. Interior Humidity has been consistently low to mid fifties. No condensation. Seems to work as designed.
Way down the road I would consider installing a built in one, also desiccant, like they did on MV freedom.
We don’t run this one underway.
NWboater2 is offline   Reply With Quote
Old 02-08-2023, 01:27 PM   #10
Senior Member
 
City: Richmond
Join Date: Mar 2017
Posts: 255
Quote:
Originally Posted by SeaDogAK View Post
I leave one running in the galley sink when the boat is tied up in the winter but put it away in the summer. They draw quite a bit of power.
Sorry, but that sounds completely backward. Unless you live in some weird location, around here, humidity is not a problem during the winter, often, it is very low. Summertime, it usually runs very high. Now, if you keep your AC on for a good amount of time, I can see putting it away.
Chuck34 is offline   Reply With Quote
Old 02-08-2023, 02:00 PM   #11
Senior Member
 
City: Juneau
Vessel Name: Sea Dog
Vessel Model: DeFever 49 Raised Pilothouse
Join Date: Aug 2021
Posts: 154
I guess Juneau, Alaska is a weird location. Things get damp and mildewy in the winter. It’s not so much of an an issue in the summer.
SeaDogAK is offline   Reply With Quote
Old 02-08-2023, 06:24 PM   #12
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 2,719
Quote:
Originally Posted by Chuck34 View Post
Sorry, but that sounds completely backward. Unless you live in some weird location, around here, humidity is not a problem during the winter, often, it is very low. Summertime, it usually runs very high. Now, if you keep your AC on for a good amount of time, I can see putting it away.
Where's "around here"? My boat is sitting in Anacortes, humidity is measured in 3 locations and uploaded every 15 minutes all winter long. It has been running about 70 - 75% with no dehumidifier running. I have the compressor type, it shuts down at around 45 deg to keep from freezing, and it's been colder than that for the last month.

Is 75% humidity a problem? Probably not as long as temps are in the 40s or below. Mold and mildew don't grow much then.
DDW is offline   Reply With Quote
Old 02-08-2023, 06:31 PM   #13
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 2,719
Quote:
Originally Posted by NWboater2 View Post
Dehumidifier is one of the first things we got for new to us GB 42 in Puget Sound.
Eva dry desiccant, drains to sink. Works in lower temps than compressor types, they say. Runs on ďautoĒ all the time. Interior Humidity has been consistently low to mid fifties. No condensation. Seems to work as designed.
Way down the road I would consider installing a built in one, also desiccant, like they did on MV freedom.
We donít run this one underway.
Questions on your experience with the Eva Dry, I assume it is a rotary desiccant type. Do you know what the lifetime of the wheel is?

I was looking into the Ecor Por, which are a ducted unit seemingly idea for a boat (ss cabinet), but they state that the desiccant wheel has about a 4-5 year life, and a new one costs around $500 or $600 - half the price of the unit. This seems like a big drawback to the technology.
DDW is offline   Reply With Quote
Old 02-08-2023, 07:12 PM   #14
Veteran Member
 
NWboater2's Avatar
 
City: Tacoma
Join Date: Apr 2021
Posts: 69
Experience so far so good - same weather as your boat, and about 20-25% less RH in the boat this winter, only had it about 4 months. I bought the Eva-Dry Edv-4000H Rotary Desiccant Dehumidifier on amazon - $300 ish.

I'm not sure this one would be worth a new wheel. Didn't realize mine or even the more industrial ones like ECOR had to get a new wheel in 4-5 years.

good luck!
NWboater2 is offline   Reply With Quote
Old 02-08-2023, 07:51 PM   #15
Veteran Member
 
City: Duvall, WA
Join Date: Aug 2020
Posts: 91
Quote:
Originally Posted by Shrew View Post
An A/C IS a dehumidifier.

Forced hot air does a pretty darn good job of drying the air as well.

Air Conditioning does dehumidify, in that every 20 degree drop lowers the absolute humidity by 50%. Sending warm moist air past chilled coils will cause the humidity in that air to condense out. However, to gain that effect, one must actually be conditioning that air. In cooler temps, cooling the air results in cold, unhappy people.


AC-style dehumidifiers work by sending warm moist air past a set of chilled coils to cause the humidity to condense out, then sending that cooled dryer air past a set of heated coils where the waste heat of the prior cooling function is waiting to rewarm the air. Efficiency losses aside, the air comes out at the same temperature it went in, but with less humidity as that H20 has gone out the condensate drain. Using a dehumidifier in cooler temps doesn't result in cold, unhappy people unless further heating is needed.
pjtemplin is offline   Reply With Quote
Old 02-09-2023, 12:05 PM   #16
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 2,719
Quote:
Originally Posted by NWboater2 View Post
Experience so far so good - same weather as your boat, and about 20-25% less RH in the boat this winter, only had it about 4 months. I bought the Eva-Dry Edv-4000H Rotary Desiccant Dehumidifier on amazon - $300 ish.

I'm not sure this one would be worth a new wheel. Didn't realize mine or even the more industrial ones like ECOR had to get a new wheel in 4-5 years.

good luck!
Yeah, at $300 if you had to replace the whole unit every 5 years, not so bad. The only desiccant wheel ducted unit I've seen is the Ecor, it is considerable more expensive at about $1300, and replacing the wheel is expensive. Assuming they are around when you need to replace it. I want the ducted unit because I'd like to install it as I have the compressor unit, in the air conditioning ducting, so that it blows air throughout the boat.
DDW is offline   Reply With Quote
Old 02-09-2023, 02:52 PM   #17
Veteran Member
 
NWboater2's Avatar
 
City: Tacoma
Join Date: Apr 2021
Posts: 69
I realize there are a lot of folks here that are older and saltier than the MV Freedom crew on youtube but i think they do a good job and they have that early N43 pretty buffed out. Take a look at the episode where he installs one of those Ecor or similar dessicant dehumidifiers. didnt look too hard and they were very happy with it.
NWboater2 is offline   Reply With Quote
Old 02-13-2023, 02:08 PM   #18
Senior Member
 
Sea Q's Avatar


 
City: Vancouver
Vessel Name: Sea Q
Vessel Model: Westport Mc Queen
Join Date: May 2015
Posts: 220
In the shed and when at the dock We use a 110v home dehumidifier during the winter Just leave it on and draining out to deck .Different we usually have 4 to 6 people on board and it does pump up he moisture and running dishwasher and cooking . Come summer we might run it overnight so that the upper bridge windows are clear .
It helps keeping everything dry and fresh. I feel a few extra bucks on running it for the cost of your boat worth is worth it.
Sea Q is offline   Reply With Quote
Old 02-13-2023, 04:17 PM   #19
Senior Member
 
Takoradi's Avatar
 
City: Isleton
Vessel Name: The Janie C
Vessel Model: Uniflite 42
Join Date: Oct 2017
Posts: 117
Quote:
Originally Posted by Osprey69 View Post
The Admiral is convinced we need a dehumidifier on-board. I can understand one running whilst away, but when we are onboard either the windows are open, the A/C is on or we have the heat going so its either in-effective or redundant.

Thoughts?
You answered your own question. Your Admiral thinks you need a dehumidifier so OF COURSE you need a dehumidifier!

Tak
Takoradi is offline   Reply With Quote
Old 02-13-2023, 04:40 PM   #20
Moderator Emeritus
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 18,558
Quote:
Originally Posted by Takoradi View Post
You answered your own question. Your Admiral thinks you need a dehumidifier so OF COURSE you need a dehumidifier!

Tak
YupÖ
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 01:16 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012