Refilling Hot Water Boiler System. Go round each radiator and close every bleed valve and drain. modern hydronic heating systems have automatic water fill valves, and automatic air purge vents.
Can't get boiler to fire after draining / refilling system Page 2 - image credit : www.diynot.com
locate the system drain valve, called a boiler drain. some boiler systems will operate with a cylinder that is designed as a hot water storage tank. Go round each radiator and close every bleed valve and drain.
Can't get boiler to fire after draining / refilling system Page 2
At this point, you will be ready to refill your central heating system. this is a video on how to purge the air out of your hot water heating system.it may seem complicated, but it is an easy task that most homeowners can do. a system boiler is a sealed system that only requires a boiler and a cylinder, whilst a regular boiler may require a header tanks in the loft to feed the hot. Generally you have to purge the air unless you have vents on each heating unit.
