The problem with what you propose is this: what happens during the winter when the sun shines bright? The oil in the collector heats up and thins out, while the plate hx is clogged with tar. The thin oil sheds its heat to warm the cold oil before it can effectively move fast enough through the loop to warm the house.
If you really need that high of a stagnation temperature, the oil will expand, too. Not as much as boiling water, but enough that you will need a holding tank. Something open to atmosphere.
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