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Do cast iron radiators take longer to heat up?

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Yes. Cast iron radiators usually take longer to heat up than other radiator types.

However, it should be noted that cast iron radiators will also typically retain their heat for longer, and stay warmer for longer when the central heating is turned off. They can do this due to the increased mass incorporated by the cast iron material.

As such, they are commonly used as kitchen or lounge radiators.