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In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Does adding a reflective sheet behind a radiator help at all? I've seen some references to these, mostly in the UK, and it seems like a reasonable idea assuming the materials aren't too expensive. One post I read suggested wrapping heavy-duty aluminum foil around a styrofoam board as a cheap solution.
I'm just a homeowner that has a steam system, take my advice with a few grains of salt.