What is balancing?
Balancing is adjusting the flow of water through each radiator on a system so that all radiators are running at equal temperatures and take an equal amount of time to reach their operating temperature. Your plumber should balance the system after installing your radiators. Lack of balancing within a system is often the cause of cold spots on radiators, radiators failing to heat up properly, or radiators making noises. These symptoms are rarely due to manufacturing faults.