The history of balancing goes back to the 1940s, when the need to adjust flow distribution in heating systems was realized to achieve the desired indoor temperature in a building. Oversizing components during design and construction cannot be avoided due to the available commercial range of products. Thus, based on the availability of the commercial products that are used for a given load range, it's important to perform hydronic balancing to obtain the required flows in the actual installation and compensate for oversizing.