Join Date: Feb 2010
Location: Narragansett Bay
Thanked 363 Times in 342 Posts
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Heater life can be significantly impacted by water quality. Hard water, in particular, can really eat them up. I've not heard of a good solution to soften water at a dock.
I do suggest a carbon filter, but not sure that will help with heater longevity.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.