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First step: dusting and purging the radiators
To ensure the proper functioning of a cast iron radiator, there are three elements to monitor: that the liquid circuit is tight; that the walls and the floor surrounding the appliance are in good condition and that the radiator does not get dirty. To carry out this dusting, the use of a brush, preferably bent to go to the most inaccessible corners, may be sufficient. After cleaning the exterior, it may be useful to drain to remove any impurities that accumulate in the circuit. It is first necessary to stop the circuit by emptying the boiler. Then, think about bringing basins to avoid flooding the ground. Then by unscrewing the nut on the side of the radiator with an adjustable wrench, the first drops will fall.
Second step: maintenance of the radiator environment
Once the circuit is emptied, it is important to make sure that the walls and the floor that house the radiator are not damaged by the heat. The radiator must be removed, taking advantage of the fact that the water circuit is switched off. Brackets hold the device to the floor and the wall. Regarding the wall, a paint job can be appropriate as well as the installation of a vapor barrier which prevents the hot wave directly impacting the wall, and which reflects the heat in the room. Now is the time to screw in and check the circuit for leaks when turning the boiler back on. In the event of a leak, make sure there is no missing gasket and that the fittings are tight.
And if the radiator is electric
In this case, maintenance is simpler and consists mainly of cleaning the heat inlets and outlets. A vacuum cleaner can be enough.