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Posted by Ron on October 17, 2005 at 21:43:22:
In Reply to: Re: cast iron or copper elements for hot water system posted by Joe Brix on October 14, 2005 at 23:19:22:
I agree with the other response. Boiler life is all in the correct near piping and proper venting. Cast iron radiation is best as you get both convection and rasdiant heat from the same radiation. Most of the heat is from radiant and less from convection. What that means to you is a lower heat loss and fuel saved.
I would use a cast iron or steel boiler due to the water volume. If you do not put enough radiation in to keep boiler condensing with a copper tube you limit the savings. Use a larger water volume and a boiler bypass in the piping. Properly size the boiler to a heat loss. This is the largest savings. Then outdoor reset, Beckett heat manager, two stage thermnostats or constant circulation. This will produce an average 30 - 50% savings. I have proven it over and over again.