I have a gas fired hot water central heating system. Water is circulated by two zone pumps at the furnace. There is an automatic fill valve.
I recently had work done on the heating system, and the water was drained from the system. We are now back online, and I have purged air from most of the radiators.
Several of the radiators are behind decorative screens that are built into the wall. Do I need to bleed every radiator in the system to get it operating up to efficient standards? If I cannot get to a few, will they eventually purge themselves of air as the water is pumped through?