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Posted by HeatPro on April 27, 2006 at 10:14:09:
In Reply to: Re: which is a good gas type hot water boiler posted by joe on April 27, 2006 at 09:20:26:
: Someone told me that cast iron radiators are better for a condensing boiler, because the return water is at a lower temperature.
++ That depends upon whether the radiators are larger than needed for the room, so the water flow can be slowed in the radiators to allow the water to cool down more inside the radiators.
: Can I reuse a few of my radiators, full of scale (from steam) and flush and treat it , or should I get a few new cast iron radiators.
++ You can flush and treat the radiators. After the radiators have been filled with water and the system sealed so new oxygen was prevented from entering, there is a limited amount of rust and scale after that for decades, so it shouldn't be much, unless there were large leaks so a lot of makeup water had to constantly enter to bring in dirt and oxygen to corrode the metal.