My father has a new boiler system. It is around a month old. His hot water pex has taken on a blackish tint. I have read that this may be normal? Is this a normal thing?
Black water
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Fred61
Minister of Fire
Chances are it's dead rust. There may have been some rust in the bottom of the vessel and more could have been produced before the oxygen was depleated from the water. Two things I know that will kill rust though not dependably is boiling and chlorine. The black is more than likely rust that has been chemically changed like conversion coatings such as anodized or chromate conversion coatings. Although it is widely thought of as ferrite, true ferrite needs to be a mixture of iron oxide (rust) and minerals such as manganese or nickel and zinc and then pressed and fired under high heat.
EDIT: Do you have return temperature protection?
EDIT: Do you have return temperature protection?
BoilerMan
Minister of Fire
The boiler is an Eko 25. Yes, it has return protection. I figured it was normal but had to ease my mind.
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