This guide explains how to fill a pressurized heating system that has been drained down, to get the very best out of your designer radiators or towel warmers. If you need some initial purchase advice with regards to your home heating, be sure to check out our Buyer’s Guide to Towel Warmers. Follow the steps listed below to see how to effectively fill your pressurized system.
To start with, you will need to close each of the air vents and drains off by turning them clockwise.
Prior to filling up, it is important to add a central heating inhibitor.
This is simple to do – just remove a radiator blank and pour the inhibitor into the system.
By doing this, you’ll assist the prevention of corrosion within your heating system.
Follow the manufacturer instructions specified on the inhibitor; one tub will generally prove adequate for up to 10 separate radiators; although maybe slightly less in the case of cast iron radiators.
There should be a filling loop on the pipework situated by your boiler.
Alternatively, you could have an internal filling loop located at the foot of your boiler.
To start refilling your system, initially open the filling loop to the downstairs radiators.
When this has been done, you can repeat the process for each of the upstairs hot water radiators as well.
Turn your radiator key in an anti-clockwise direction until water starts to dribble out.
Note: If you have a towel radiator, make sure you do this last as it will typically be the highest point of the heating system.
After each of the radiators have been filled, close the filling loop with the system pressure set at around 1 to 1.5 bar. It is advisable to ask somebody to monitor the pressure as you are filling up to prevent the risk of over-pressurizing the system.
Once your system has been re-pressurized, your boiler can be switched back on. Always ensure that your radiators are warming up properly.