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Many period homes, churches and public buildings discarded their original cast iron radiators, disconnected them from the system and threw them onto the scrap heap as old and outdated, replacing them with modern steel radiators. This trend began in the 1960's. As there were no more cast iron radiators being produced the cast iron radiator moved towards extinction.
Many customers have commented on the better heat output within their homes since cast iron radiators replaced the modern radiators. Cast iron radiators are energy efficient radiators and a good energy saving radiator choice. Cast iron is far denser and heavier than steel, so the cast iron holds the heat for a far longer length of time once your boiler has been switched off. The cast iron radiator will gradually cool down whereas the steel radiator will lose its heat quicker, meaning a room space will cool in a much more quickly.
Studies have also shown that the conductivity of cast iron is higher than that of steel, so the heat transfer from the cast iron radiator surface into the room is much better than steel. Steel tends to emit a blast of heat in a short space of time whereas cast iron, although will take a little longer to reach temperature, will gently radiate an ambient heat over a much longer period of time. Higher amounts of carbon in cast iron allow it to retain heat for a longer period of time than steel. This high carbon content allows heat to diffuse through the cast iron evenly, which means the surface conducts heat more efficiently, making the cast iron radiator a more energy saving radiator.
Yes. Your boiler will benefit from cast iron radiators because the temperature of the water that is returning is hotter when cast iron radiators are on your system as opposed to modern steel radiators. As your cast iron radiators will hold its heat better, and for longer, the water in the system will return to your boiler hotter making it more efficient, providing better energy-efficient heating.
Originally cast iron radiators were seen as more efficient for period homes only with their large rooms and high ceilings; however there are a growing number of heating consultants and architects now specifying cast iron radiators for new properties due to the efficiency and better looking design choices that enhance the rooms. As we move towards more energy efficient heating with the use of our energy resources, modern homes are now enjoying the benefits of the efficient cast iron radiator on modern central heating systems