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If you can point to it on a boat, or even vaguely heard of it existing on your boat, it will fail eventually. The sole exception I've had to this was solar panels, which behaved flawlessly. Everything else is work, work, work. Were I to pick mean time between failures for things:
Refrigerators 5-10 years depending on the make model.
Pumps, probably about 2 years with regular use.
Heads, jabsco's need to have their chocker valves replace every year or so and be completely replaced every 5.
Outboards are good for around 1200 hours, then you should sell it and get a new one before the repairs get to be too expensive
Diesel engines. Maybe good for 20-25 years?
Plumbing fixtures probably good for around 10 years.
Interior paint, carpet, floors, upholstery are good for around 10 years.
Sailboat canvas is probably good for around 5-10 years depending on type.
Rigging probably should be inspected and possibly replaced every 10 years or so.
Flourescent bulbs are good for about a year, LEDs should be good for 10.
Electronics are good for around 10 years or so.
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