On many Euro boats the external units are simply bolted to the stern rail.
If sea spray bothered them , I am sure they would use a different location.
On a pleasure boat an outside mount and paint to match the area should be fine.
One huge advantage is HEAT production is 300% to 500% better than a heat wire , when it gets too cool for reverse cycle to function .
For a winter liveaboard that pays for electric , this could be critical.
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