Glenn Ashmore wrote:
"Garland Gray II" wrote ...

Glenn,
I ran heater hose up about 18" then over about 15 ft and back down to the
water heater in the opposite hull of my cat. It works fine, but I made
sure there was no air in the line when I hooked it up by filling the
entire run with a funnel on one hose end. The water heater was slightly
lower than either engine, though.



That is encouraging. My installation will not be that bad. Only about 6'
to the heater. No room for an expansion tank at the high point so I may
just add a couple of bleeder valves there.

This is getting to be a real pain now that the engine is blocking the best
access to the engine compartment. I have to lay on an aft bunk and slide my
head and shoulders into the access hatch to do anything. Inevitably once I
squirm into position I find that I have the wrong size wrench!

My Yanmar 1/2/3 GM installation manual allows you to have
the heater inlet/outlet up to 0.5m above the water pump
inlet as long as the overflow tank is installed above it,
and have a air bleeder valve at the heater.

Sorry about the constriction in your engine compartment. On
my boat I don't have a "compartment", I just lift a
mattress and the engine is there. I can almost stand up
beside it. Typical cat elbow room will make maintenance so
easy (o.k. except for Yanmar's stupid water pump impeller)

Evan Gatehouse