A radiant heating system is a type of heating system that uses radiant heat to warm a building. They are easily identifiable in old buildings by the historical "radiators". They are also easy to identify when you see "strip heaters" along a wall, usually along the wall and the floor.

Radiant heat is heat that is transferred from a warm surface to the objects and people in a room through electromagnetic radiation.

In a radiant heating system, the heat is generated by a boiler or other heat source and is transferred to the floor or other surfaces through a network of pipes or cables. The heated surfaces then radiate heat into the room, warming the objects and people in the space.

There are two main types of radiant heating systems: hydronic systems, which use hot water to transfer heat, and electric systems, which use electricity to heat wires or cables. Radiant heating systems are highly efficient and can be used to heat a single room or an entire building. They are often used in conjunction with other types of heating systems, such as forced-air systems, to provide a more comfortable and consistent level of heat.