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post #41 of 105 Old 11-07-2012 Thread Starter
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Re: Winter Moisture Control

This is great! I'm really getting a lot from reading thoughts on all sides of this debate and I really appreciate all of your comments! What I have done so far is: Applied mildew/mold resistant primer to the hull and put reflectix over that. The thought being that if there is any mold build up behind the insulation it will be kept to a minimum. I have ordered the hypervent for the settees and v-birth since most everyone agrees that it is a good thing. This leave me with venting or dehumidifying... Since I will need heat either way, I need to choose an appropriate heater. My boat is on 25' so it isn't much space to heat, and I do have shore power. So to redirect this thread for a sec, who is using what heaters and any opinions (and I KNOW you have them ! ) on what may work best for my small space. THANK YOU ALL!
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post #42 of 105 Old 11-07-2012
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Re: Winter Moisture Control

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Originally Posted by TheTardis View Post
This is great! I'm really getting a lot from reading thoughts on all sides of this debate and I really appreciate all of your comments! What I have done so far is: Applied mildew/mold resistant primer to the hull and put reflectix over that. The thought being that if there is any mold build up behind the insulation it will be kept to a minimum. I have ordered the hypervent for the settees and v-birth since most everyone agrees that it is a good thing. This leave me with venting or dehumidifying... Since I will need heat either way, I need to choose an appropriate heater. My boat is on 25' so it isn't much space to heat, and I do have shore power. So to redirect this thread for a sec, who is using what heaters and any opinions (and I KNOW you have them ! ) on what may work best for my small space. THANK YOU ALL!
On submarines, our greatest fear was fire or flooding. I am rather paranoid when it comes to heat producing equipment, and the load placed on electrical systems.

You really, really don't want to come back to your boat after a hard days' work and find a hull burned down to the waterline. Not to mention that you have a furry friend onboard.

First, make damn sure that your boat's shore power system is safe, and do not exceed it's load limit. (amperage)

Second, I've found that the oil-filled electric radiator heaters are much safer than forced-air fan heaters with the heater element. The oil-filled heaters have a tip-over shutoff for safety. They make a nice, dry heat.

I have a forced-air heater as a booster, but I NEVER run it unattended.
I also have a Coleman "Black Cat" catalytic propane heater, that will be my emergency booster on those few 11F degree days. I've seen 9F degrees since I've been in Maryland. It ain't pretty. The Coleman heater can be plumbed to a large propane bottle that you keep out in the cockpit if you buy the adapter kit.

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post #43 of 105 Old 11-07-2012 Thread Starter
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Re: Winter Moisture Control

Thanks for the suggestions! All of the boat's shore power system is brand new, she previously only had DC power. I agree that the electric heaters scare me too. However, it looks like you still have to plug the oil heater in. Sorry if this sounds silly, but how are the two different in that department? What makes the oil heater safer if it is still part electric? (Originally from AZ, don't need many heaters there!) I do have some of the small propane heaters also.

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post #44 of 105 Old 11-07-2012
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Re: Winter Moisture Control

I wouldn't use any 'unvented' propane heaters below.. danger of CO buildup.

Our electric fan heater has a 'tilt' switch and shuts off if it falls over, I think the biggest advantage of the oil heaters is that they are quieter.

Espars and the like are thirsty both for fuel and power.. so there's no 'free lunch' as they say. If you've shore power available I think a combo of a dehumidifier and a modest heater should work. (the dehu gives off some waste heat too)

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post #45 of 105 Old 11-08-2012
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Re: Winter Moisture Control

I lived aboard in Wash DC and Annapolis for three winters on an Ericson 30 (headliner with just an air space for insulation), and kept the boat comfortable with two 1500 watt forced air heaters. No condensation.
I think the key is keeping the air moving with hot air, when you heat the air it reduces the humidity. Radiant heaters don't reduce the humidity. Stay warm.
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post #46 of 105 Old 11-08-2012 Thread Starter
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Winter Moisture Control

Thanks Brian. Did you ventilate then?

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post #47 of 105 Old 11-08-2012
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Re: Winter Moisture Control

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Originally Posted by TheTardis View Post
However, it looks like you still have to plug the oil heater in. Sorry if this sounds silly, but how are the two different in that department? What makes the oil heater safer if it is still part electric? (Originally from AZ, don't need many heaters there!) I do have some of the small propane heaters also.
The oil heater s an electric heater with the heating elements inside an oil chamber. Ther is no fan on an oil heater. They get warm and air flows by convection. The other electric heaters have a fan that blows air over exposed electric elements that glow red hot.
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post #48 of 105 Old 11-08-2012
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Re: Winter Moisture Control

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Originally Posted by amarinesurveyor View Post
.....when you heat the air it reduces the humidity.
That's not exactly correct. The higher the temperature of the air, the more moisture is can retain as humidity. Condensation occurs when the air is saturated with moisture and can't hold any more. Heat the air and it can hold more water, but its still there.

Its super cold air that can't hold much humidity.
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Re: Winter Moisture Control

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That's not exactly correct. The higher the temperature of the air, the more moisture is can retain as humidity. Condensation occurs when the air is saturated with moisture and can't hold any more. Heat the air and it can hold more water, but its still there.

Its super cold air that can't hold much humidity.
OK, so maybe I should have said...lowers the relative humidity? The point I was trying to make is that CIRCULATING warm air and heating the inside surfaces seemed to reduce or eliminate condensation for me, and I never found the need to ventilate. Everybody has their own opinion or experience in this matter, some maybe haven't even tried to live aboard in winter, who knows. I was just offering my experience of what worked for me.
Minnewaska, your post is not trying to help them solve the problem of staying warm and dry. Why not offer some helpful advice?
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Re: Winter Moisture Control

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Originally Posted by amarinesurveyor View Post
OK, so maybe I should have said...lowers the relative humidity? The point I was trying to make is that CIRCULATING warm air and heating the inside surfaces seemed to reduce or eliminate condensation for me.......
Agreed, if you actually get the surfaces warm. It's when moist warm air meets cool surfaces that the air next to that surface will lower to the dew point and you get condensation.

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Minnewaska, your post is not trying to help them solve the problem of staying warm and dry. Why not offer some helpful advice?
Brian
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