A1Sailor
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So no need for a dehumidifier - if you have an Eberspacher!I agree with Sandy, ventilation is the priority. Using boats all year round for 24 years or so, have never felt the need for dehumidifier. Eberspacher blows any stale air out very successfully. As far as insurance claims are concerned, I've never heard of one being rejected but, if an insurer really wanted to be picky, they could always claim that using something clearly against the makers instructions could be deemed negligence. As others have said, best bet is to ask insurers (in writing) if covered.