Hydronic systems use water to transfer heat for heating or cooling spaces. They typically consist of a network of pipes, a heat source like a boiler or a heat pump, and radiators or underfloor heating elements. This method is efficient because water can hold and transfer heat effectively. In a hydronic heating system, warm water circulates through the pipes, radiating heat into the rooms. Conversely, in cooling applications, chilled water absorbs heat from the air. Hydronic systems are popular in residential and commercial buildings due to their energy efficiency and comfort.