Join Date: Jan 2003
Location: Maine Coast
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A marine indirect/electric type hot water heater is in a sense a giant thermos that has a "coil" or "element", if you will, of tubing running through it which engine coolant flows in and out of. This coil is submersed inside the "thermos" and transfers heat from the engine to the domestic H20 much like a radiator does to air.
If I read your statement correctly you want to "by-pass" this unit. If you do be sure you don't disturb the engines cooling flow.
The easiest way to do this, not necessarily the best way, is to disconnect both the supply and returns from the engine cooling system at the hot water heater. Then simply put a male/male barbed coupling in between these two hoses and bleed any air out of your engines cooling system.
By-passing the domestic side is the same (male/male hose barb) and is what I do in the winter when I winterize my system so I don't have to fill my entire water heater with antifreeze just the domestic water pipes/tubing.
-Maine Sail / CS-36T
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Last edited by Maine Sail; 01-19-2008 at 03:41 PM.