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Message: <blockquote data-quote="amdfaisal" data-source="post: 3456748" data-attributes="member: 4871">boiler feed water ka? distilled water rite? pure H2O... but the problem with rust is the O inside the H20 that bonds with the Fe (or any other metal alloy for that matter) to oxidize (<a href="http://en.wikipedia.org/wiki/Rust" target="_blank">http://en.wikipedia.org/wiki/Rust</a>) it, so distilled or not water still contains oxygen molecules so to prevent the radiator from rust, ppl use coolant (or antifreeze) that put the effect of rust in slow-mo...pure water is perhaps better than non-distilled water because the presence of other minerals may accelerate the rusting processjust my 2 sen... some nice articles to get those neurons to interconnecthttp://www.jcna.com/library/tech/tech0011.htmlquoted from a guy who is into chemical engineeringAlmost everything is soluble in "pure" water to some extent, even metals, though ever so slightly - it slowly leaches out many of the elements in metal alloys and can cause the metal to fail prematurely.One notorious example concerns stainless steel grades 308, 311, 316 and 321. Most people think of these grades of stainless as immune to water - it sort of is, but isn't in some conditions. When stainless is welded - eg to join it to something, or to form a tube - there is what is known as a heat-affected zone on either side of the weld.It just so happens hot water attacks this heat affected zone leaching some of the metal and causing microscopic cracks to form between the crystals in the metal. The result is a weld can literally fall out of a tube after as little as 3 months - I've seen this and have some photos someplace.I would expect similar problems occur with radiator cores - they involve very thin copper alloys containing elements that are slightly soluble in water.The coolant used in car radiator systems is specifically designed to stop this kind of slow attack. The difference is that using coolant an ordinary radiator core should last 13-15 years (say 170,000 kms). With distilled water I'd expect you'd be lucky to get one third of that life before the radiator failed.<a href="http://forums.whirlpool.net.au/forum-replies-archive.cfm/168147.html" target="_blank">http://forums.whirlpool.net.au/forum-replies-archive.cfm/168147.html</a></blockquote>

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