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one other thought, you need a vent on that system, you cant heat water without a place for it to expand or you will break something.

you might consider just putting the exchanger in the line from engine to heater core. As long as your fresh water pump is not running then cold water will not circulate through the fresh water side and there probably will not be much heat loss. You can insulate the heater core to help. This...

maybe your truck is different from 1009 but I was not aware of a heater control valve. There is always flow through the heater core, the air flow is the only thing controlled. I replaced my heater core and the hoses connect directly to the heater core with no valve. you would want a valve in...

it looks good but you have no idea what has been put through it and it is pretty large for the heat you need. I would buy something like this if I was planning on using the engine coolant for heating the water...