You can flush a gas central heating system
You can flush a gas central heating system
If you need work carried through on your fully pumped central heating system you may want to flush the system. To exchange radiator valves or add an additional metal radiator as an example. This is often carried out by the heating engineer during repair or extension work although some experienced homeowners have been known to flush their own central heating systems.
The main reason for most people for Draining their central heating system is to clean the radiators. Before any work is attempted you need to switch off the central heating pump and gas boiler. Prevention of any extra water entering the central heating system is also a priority.
The central heating system has a tank in the attic which will ensure that any water shortfall is topped up. The flow of water in the expansion cystern is regulated by use of a common ballvalve. If water level falls the ball, floating on the surface, also falls venting the valve and letting more water into the gas heating system. This is what needs to be contained when Draining your metal radiator. A good way to do this is to stop the ball moving by tying it to the top of the tank.
Now take a hose emptying into an outside clean and connect this to the outlet valve on the bottom of your radiator. Water will now rate of flow out of the radiator through the hose into the external clean. The hose pipe needs to be connected to the lowest point in your heating system which will be one of the ground floor radiators. Before you commence any other work on this gas heating system you must now check that all the water has emptied out and no other the water is entering into the radiators.
By opening the bleed valves in the heating radiators on the top level you will help air to enter the central heating system and accelerate up the Emptying process. When completed work can now start on the system.