Water always flows through the heater hose, it will not have a tendency to overheat. You can plug
the hoses, which replicates what it there with no hoses or take a short hose and conned the two.
This is identical to the heater in an automobile. Just it goes to a water heater instead of an air heater is all.
If Iím plugged into a dock
, I try to leave with the heater hot, itís my belief that with the water in the heater being hot, the engine warms up faster because of course that flow of heat goes both ways.
If the heater is cold, you right it will take longer for the engine to warm up fully, cause it has to heat that water in the tank too.
In a properly operating engine there is a rather large excess cooling
capacity, itís designed that way of course, to overheat you really have to lose quit a bit of capacity, which of course can happen.