The most significant practical advantage of choosing a cast iron radiator is its exceptional heat retention. Unlike modern thin-gauge steel radiators that heat up and cool down almost instantly, cast iron is a dense material with high thermal mass. Once it reaches temperature, it stays warm for a significantly longer duration, emitting a gentle, radiant heat that maintains a consistent «ambient» warmth throughout the room. This makes them particularly effective in older buildings with high ceilings or solid stone walls where maintaining a steady temperature can be a challenge.