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you didn't say what car you have,
but this attached diagram might help you...
i think a good place to tap for vo heat exchanger feed would be after the block but before the heater valve...
tap the vo heat exchanger return in somehwere after the thermostat but before the waterpump...
if you did this, you would in effect be running your vo heating circuit in parallel with your cabin heating circuit and they would be independent of each other
when considering where to tap your coolant lines, keep in mind that before the thermostat is opened (while the engine is still heating up to operating temperatures) coolant will not be flowing through the radiator
also, you might like to consider adding a simple valve to your vo hot water source line... this way you could shut off the heat to your vo system should you ever want to (like if you decided to fill this tank with diesel)
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