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Mod/con boilers for old houses
I would appreciate some technical info on a simple question about the use of Gas fired Mod/Con boilers when used on old houses with Cast iron rads requiring a minimum of 150-160deg water temp to provide enough heat for rad output. I know enough that these new boilers when temp gets about 160deg they no longer perform in the 92-95% efficiency range. Is this true and what is solution, also related to Copper fin which needs a minimum of 180deg without adding more baseboard to compensate for different output. Thanks for info.