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Ah yes, the all powerful airlock... Have spent wayyyyyyyyyy too much of my life being fooled by them (I am a pipefitter after all)

Yeah al is supposed to transfer heat very well, fin tube for baseboard radiators is copper pipe with al fins. So I second what Jim said. I would suspect there to be electrolysis issues too tho, but it would be the heater core that would be reduced, so you are in the same boat as before.