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Flushing a Central Heating System

When having a new boiler or central heating system installed it is very important that the pipe work and radiators are flushed out before the boiler is commissioned – this is called: Flushing a Central Heating System.
During the installation process debris and flux will, inevitably end up in the pipe work and if not flushed out can cause harm to your boiler.

The flushing process should be carried out at least twice, one cold flush without the boiler connected and at least one hot flush with boiler connected. The hot flush will loosen up any flux residue, this residue is corrosive and harmful to your boiler.

The flushing process should be carried out at least twice, one cold flush without the boiler connected and at least one hot flush with the boiler connected

If you are having a new boiler connected to your existing pipe work there will, more often than not be magnetite (black sludge) present so dealing with this is very important for the health of your boiler.

Boiler manufacturers will give the flushing recommendations in their manual and list the cleaners/inhibitors that they recommend using. So ask your engineer about this when having your new boiler or heating system fitted. If the criteria has not been met, which includes charging the system with inhibitor, then this WILL negate the manufacturer’s warranty.

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