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Unvented Undersink Water Heaters. For D.I.Yers.

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Carrying on from a recent thread about the potential dangers of amateurs installing unvented undersink water heaters incorrectly….. Click on this

 

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    Tin (or for non drinking water plumbing, arsenic) can be added to the copper/zinc mix of the brass to increase the resistance to selective leaching of the zinc. Fittings made of such alloys should be marked DZR if sold as dezincification resistant. 

    If you live in a soft water area, such fittings should be pretty much de-rigeur, and copper olives.. Water that is slightly acidic (traces of sulpher dioxide and carbon dioxide will do this) are likely to be more problematic than those that are alkali or chalky. Pure zinc/copper can reduce to spongy orange copper at a rate of hundreds of microns per year in sightly chlorinated water. Cheap brass with impurities like traces of iron is far faster.

    Mike.

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  • 0

    Tin (or for non drinking water plumbing, arsenic) can be added to the copper/zinc mix of the brass to increase the resistance to selective leaching of the zinc. Fittings made of such alloys should be marked DZR if sold as dezincification resistant. 

    If you live in a soft water area, such fittings should be pretty much de-rigeur, and copper olives.. Water that is slightly acidic (traces of sulpher dioxide and carbon dioxide will do this) are likely to be more problematic than those that are alkali or chalky. Pure zinc/copper can reduce to spongy orange copper at a rate of hundreds of microns per year in sightly chlorinated water. Cheap brass with impurities like traces of iron is far faster.

    Mike.

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