Flushing the heating system







Flushing the heating system

Taking the water out of a fully pumped central heating system makes many upkeep tasks easier. To exchange the heating boiler or a heating radiator is a frequent reason. Whilst this will be carried out typically by an experienced engineer it is something that the well-rounded jack of all trades can execute if they have the experience of other household maintenance jobs.

In most situations Emptying the central heating is executed to clean the heating radiators. Before any work is attempted you need to switch off the central heating pump and gas fired boiler. It is also important that you do not let any more water into the gas central heating system while you clean it.

Your gas central heating system is filled up with water through the expansion or header tank. A ball valve mechanism, as used in toilets, is used in the expansion cylinder to govern the passage of water. Rising water levels in the cystern mean that the valve is closed as the ball floats higher on the water surface. However when some water is drawn off the cylinder, the ball drops, the valve opens and more water gets into the tank. This is what needs to be stopped when Draining your heating radiator. To prevent any more water entering the valve needs to be off.

Having prevented the entry of any water to your gas heating system you can now take the next step by joining a hosepipe to an outlet valve on a metal radiator and running this to the outside of your property. The water from your metal radiator will rate of flow through the hose and out of your metal radiator system. The hose needs to be connected to the lowest point in your central heating system which will be one of the ground floor radiators. You now need to be patient and check that all the water has discharged out and that no more water is entering before any other work is executed on the gas heating system.

To make your heating system drain faster you should vent any bleed valves on your metal radiators, starting with the heating radiators on the top level and working your way down. Work can start when all the water has flushed out.

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