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Old 25-01-2025, 10:34   #1
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AC thru hull height

Hi all,

I’m finishing a Climma AC install on a Pearson 424 and I’m considering where to locate the cooling water discharge on the side of the hull.

I want it high enough so it’s not submerged while heeling or in rough water, but also want to be considerate of others in an anchorage so it doesn’t make a ton so splashing noise when it’s running. The boat is rarely at a dock, only anchorages or on a mooring.

The interwebs seem to think 4-8” is high enough, but I feel it should be 8” minimum, 10-12” even better, but I’ve never done an AC install. Anyone have any opinions on this?

Thanks in advance.
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Old 25-01-2025, 11:17   #2
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Re: AC thru hull height

Quote:
Originally Posted by Peregrine1983 View Post
Hi all,

I’m finishing a Climma AC install on a Pearson 424 and I’m considering where to locate the cooling water discharge on the side of the hull.

I want it high enough so it’s not submerged while heeling or in rough water, but also want to be considerate of others in an anchorage so it doesn’t make a ton so splashing noise when it’s running. The boat is rarely at a dock, only anchorages or on a mooring.

The interwebs seem to think 4-8” is high enough, but I feel it should be 8” minimum, 10-12” even better, but I’ve never done an AC install. Anyone have any opinions on this?

Thanks in advance.

Two dumb questions. I have installed AC before, very successfully, but both times on multihulls. Different problems (very shallow bilges).


1. Will the AC run underway when heeling? I doubt it.
2. What harm would it do if it dunked under occasionally? I'm sure mine have. Storm are like that. But the system is sealed. The only reason to discharge above the water, I believe, is to aid in purging air at startup.


I doubt it matters that much. I just looked in the Dometic manual and it does not specify a distance. Not important.



On multihulls you damp the noise by puting it inside the hulls, under the bridge deck.
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Old 25-01-2025, 11:39   #3
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Re: AC discharge height

The primary reason to discharge above the water is to confirm that your circulation pump is working. Ours are about 4” and you can’t hear them.
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