Which type of heating system relies on the circulation of hot water throughout pipes?

Hot water heating is a system that specifically uses the circulation of hot water through pipes to distribute heat throughout a space. In this type of system, water is heated in a boiler and then circulated through a network of pipes, which can connect to radiators, baseboards, or in-floor heating systems. This method is efficient for maintaining consistent temperatures and is favored for its ability to provide comfortable heat without the harshness often associated with other methods.

While radiant heating does involve heat transfer that may be associated with hot water (especially in in-floor systems), it is not limited strictly to the circulation of hot water; it can also refer to systems using radiant panels that might utilize electricity or steam. Convection heating primarily relies on the movement of air as a heat transfer mechanism rather than water, and steam heating operates with steam instead of hot water, making hot water heating distinct in its operation. Thus, hot water heating is clearly defined by the use of circulating hot water throughout its system, which sets it apart from the other types listed.