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Posted by Joe Brix on October 14, 2005 at 23:19:22:
In Reply to: cast iron or copper elements for hot water system posted by john edwards on October 14, 2005 at 17:43:14:
I guess you're conveting to hot water. You're right, water in a closed system becomes "dead", all the O2 driven out as long as there's no leaks and make up water keeps comming in. Cast iron rads or BB produces more even heat and less noise. If you over radiate, you can run at a lower overall temp on the boiler saving fuel. If you use gas or LP, get a condensing boiler.