A radiant heat manifold brass is a component of a domestic hot water system that is used to distribute hot water to different areas or zones of a building. The manifold is typically made of brass, which is a durable and corrosion-resistant material that can withstand the high temperatures and pressures associated with domestic hot water systems.

The manifold is typically located near the water heater or boiler and is connected to the hot water supply line. From there, separate lines run to each zone or area of the building where hot water is needed. The manifold allows for precise control of the temperature and flow of hot water to each zone, which can help improve energy efficiency and reduce waste.

In a radiant heat system, the manifold is used to distribute hot water to pipes or tubes that are installed beneath the flooring or behind the walls. This creates a gentle, even heat that can be more comfortable and efficient than traditional heating systems. The use of brass for the manifold ensures that it will withstand the high temperatures and pressures associated with this type of system, and will provide reliable service for many years.