What is the main difference between a 'hot water' radiator and a 'steam' radiator?

The distinction between a "hot water" radiator and a "steam" radiator primarily lies in the type of fluid used for heat transfer. Hot water radiators operate by circulating heated water through pipes, which then transfers heat to the surroundings. In contrast, steam radiators use steam, which is produced by boiling water. The steam travels through the radiator and condenses back into water, releasing heat into the space.

Understanding this fundamental difference is essential for recognizing how each type of system functions and their respective applications in heating. Hot water systems tend to provide heat more gradually and consistently, while steam systems can heat spaces more quickly due to the high temperature of the steam. However, the main distinction remains centered on the medium used: water for one and steam for the other.

This knowledge is crucial for anyone in the field of heating, as it influences choices in system design, efficiency, and the specific requirements for installation and maintenance.