How does one put in an inhibitor into a combi boiler central heating system?
There’s several ways you can do it, if you’ve bought the inhibitor in the bottle then you can: Drain one radiator (ideally the smallest) remove the radiator, leave the valves shut and remove the 1/2″ cap from the top. Add the inhibitor through the 1/2″ hole then do the cap back up and reconnect the radiator. Drain half of the heating system water, remove a radiator from upstairs and pour the inhibitor down one of the pipes that connects to the radiator valves. Alternatively you can buy a special concentrated inhibitor which comes in a tube and requires the use of a silicon gun to add to the system, this is a lot easier to use on a sealed heating system (combi): Drain the water out of one radiator and leave it connected; remove the 1/2″ cap from the top of the radiator, insert you inhibitor into your silicon gun and put the little nozzle from the inhibitor tube into the 1/2″ hole, squeeze all the inhibitor out into the radiator. Do the cap back up and refill the radiator. This is the ea
