I disagree.An electric pump is a waste on a small boat that doesn't have a true bilge (single lowest collection point).
I see an electric bilge pump as protection against sinking at a dock, due to small leaks, when the boat is unattended.
Based on when my depth transducer was leaking on my 87, most water makes it's way back to the volcano area. (because the C22 usually sits lower in the stern)
Some is trapped, but a hole drilled between areas should solve much of that.
Besides, left long enough, eventually the water will get high enough to flow to back to near the volcano.
This season my boat will be at a dock and I will DIY install an electric one that works without a float switch. (along with a remote monitoring device)
It's extremely rare, to get any water in, but I figure why not. Especially if it helps with insurance and marina regulations.
This spring I will also be removing and filling my old transducer and speed log thru-hulls, so that only the volcano and sink drain are there.
(cockpit drains through the transom)
When I service my keel I'm considering filling the sink drain in as well, (and using a water jug as a grey water tank)
I have yet to look into all manual bilge pumps but I suspect that a bucket will work faster than a bilge bump. Especially when my wife is telling me to bail faster.
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