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Subject: Re:TWL: Trawlerworld Discussion thread on water heaters and water makers...
From: Jim (fidlerjim@XXX.XXX)
Date: Wed May 01 2002 - 22:49:12 EDT
Perhaps someone has already said this and I missed it.
I've read that pure distilled water with no calcium hardness is pretty
corrosive to most metals even if there is no sodium chloride involved. If
the output of a water maker has no dissolved calcium like most tap water
does, then perhaps the shortened life of water heaters results from this.
In swimming pools, calcium chloride is added if necessary to bring the
hardness up to several hundred ppm. This prevents the plaster from
dissolving and, I believe, the metal parts in pool heaters and pumps from
being etched and corroded. Of course, too much hardness causes scale to
form in the heater and elsewhere.
Couldn't this explain the alleged shortened life of marine water heaters
with water makers?
Jim Fidler
"Fiddlesticks"
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