Pelago was pretty primitive - no hot water, no reefer, no windlass, not much of anything we have on Compass Rose - just pure sail.
We do have a water heater on Compass Rose, but its highest point is about the same as the high point on the engine.
I always thought coolant flow between the overflow tank and the engine was caused by pressure/vacuum in the system. When the coolant heats up the pressure pushes it past a spring in the pressure cap and into the overflow tank. When the engine cools it creates a vacuum in the cooling system and sucks the coolant back into the engine past another spring.
If this is correct then the height differential shouldn't make a difference.
--- In firstname.lastname@example.org, Harry James <welshman@...> wrote:
> The engine in Sheer is located very low down. In the old A4 installation
> there was a loop to a red dot heater, I plan on using a coolant loop off
> the engine through a hot water heater and the red dot. Both these
> things are above the engine. How will this impact things like the
> coolant bottle that plumbs into the engine next to the coolant
> fill/pressure cap?
> Eric, did you have a hot water heater in Pelago? If so it had to be
> above the engine as everything is above the engine in a Col 38 or 40.
> How did that work out?
> My only experience with this is in Princeton Hall where the coolant loop
> that feeds the defrosters in the Pilot House is well above the engine,
> apparently to no negative effect.
> Anybody else have the coolant loop to the heater above the engine?