Draining down the central heating

Below is a guide if you ever have the need to drain down your central heating system below is a guide how to do it. Enfield Plumbers are experienced in draining down central heating systems.Isolate the power supply to the central heating system. If it is a vented system you must now turn off the isolation valve which supplies the system. You will not need to do this on a sealed system as there is no permanent water connection to the boiler. The isolating valve for the vented system can be found on the inlet supply pipe to the feed and expansion cistern, located in the loft. You are now ready.Connect the hose and open the valve on the drain off cock at the lowest system point. (near the boiler usually).Locate a radiator at a high point in the system and open the air release valve using a radiator key. This will help assist the draining down by allowing air into the system, You should hear the air rushing into the system as a water flows out.Open up more and more radiators ensuring to do the higher-level radiators first until they are all done.When complete, close all the valves ready for filling up again. Sometimes the drain off Cock can fail to open because the washer is stuck onto the seating. If so it is a good idea to try and locate another valve.Note:The water that has drained from heating system can be just like black ink can cause staining just the same so protect you carpet. If you do not feel confident to carry out this job which is quite time-consuming and can cause problems it done wrongly, you should seek professional advice from someone like an Enfield Plumber.