What is balancing a system?
In most heating systems, all of the radiators are on at the same time, so the system must be balanced to stop the first few radiators using all the hot water, leaving those at the far end of the system taking a long time to get hot, or never getting hot at all. Balancing involves individually adjusting the lockshield valve (at the opposite end of the radiator to the TRV) so that water is spread more evenly.
How does Genius Hub affect this?
In many cases, a Genius Hub system is more resilient to poor balancing. With Genius Hub radiator valves (Genius Radiator Valves and Wireless Radiator Valves), only the zones that need heat are heated, rather than every room at once, and each valve adjusts individually to the right position to get hot water. However, this does not remove the need for the system to be balanced properly by a heating engineer: if some radiators are turned right down on their lockshield valves, the radiator valves will not be able to compensate for that.