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Join Date: Sep 2005
Location: New Westminster, BC
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On a previous boat with the heating coil above the engine we added a forced circulation pump to the loop because it was hit-and-miss whether we got enough flow naturally to heat the water.
We later changed the tank to a lower profile model (lower than the engine) and didn't need/use that pump anymore. We also had a 'bus heater' (similar to what Olson describes above) in a parallel cct, that may have been part of the problem with the waterheater circuit....
On the current boat the water heater is about 6 feet from the engine with the coil hoses below the height of the coolant resevoir. It works fine (no additional space heater in the circuit).
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)