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Posted by Gern Blanston on April 30, 2002 at 19:05:27:
In Reply to: Re: cast iron posted by Tony Conner on March 31, 2002 at 09:08:14:
Tony is right. Another thing to consider is that because of their irregular shaped sections, cast iron boilers don't have a smooth collecting area at the bottom for a good blowdown. Water treatment intending to "clean up" the system is likely to cause the scale and sediment to accumulate in the bottom of the boiler sections. With no good way to blow it out, it eventually insulates the water from the fire, overheats, and causes cracks.
Cast iron boilers should only be used in closed-loop systems.
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