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I have rhe same issue. I am thinking it might be that at some point the HW heater had water left in it and froze cracking the ceramic lining so now the water is coming in direct contact with steel. It smells just like a boiler being drained. I have also flushed it out real good and seen blue chips which are smoooth come out. Not 100% sure but after all of the boilers that I have replaced I think I know what that water smells like.
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