Black cast iron radiator products emerged in the late 19th century, offering over 30 years of corrosion resistance, 30–60 minutes of heat retention after shutdown, low noise, broad heat source compatibility, and refurbishable value. When buying, calculate heat output per room, match connection sizes, check for smooth surfaces and internal anti‑corrosion coating. For maintenance, use wet storage after heating season, clean the strainer every two years, wipe with a damp cloth, avoid impacts, and leave 10 cm clearance.
