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I just reread my original post and my question still remains: why would I not have engine heat from the aquahot for hot water after driving all day?  Is the engine/AH hose part of the ‘loop’ that also supplies the front heater core? I need to draw a picture…

I cannot tell you for sure how they did the lines, but from Richard was saying there is a loop for the dash heat and a loop for the aquahot. I think you need to verify what valves you turned off, you may have turned off the valve for the aquahot. 

There should be 4 valves. I just went out and located mine because to be honest I had no idea where they were located. 

Here is what I found on my engine all on the driver side of the engine, 2 valves just above the oil filter housing, 1 valve just behind the water pump, and 1 valve on the top of the engine next to the valve cover/thermostat housing. I believe the valve at the water heater should be a return line, and I would think that possibly the valve on the top of the engine is the other return line. The two just above the oil filter I would think are the supply to the aqua hot and to the heater core. Maybe one of the other guys can confirm this.