I have a 20 year old boiler which I have been informed works efficiently. My pump is situated upstairs next to the hot water tank. In an adjoining vertical pipe there is a brass valve on the top to bleed air. There is no air in the radiators, and the little that accumulates in one is bleed frequently. They heat up well.
When either the hot water or the central heating is on there is a gurgling sound of air either in or very close to the vertical pipe with the valve. An engineer had to be called because air had got into the pump and it stopped working. He got it going. Following his departure the gurgling continued for three months until the pump stopped again. I have now had a new Grundfos pump installed and it is set to the maximum which is 45 rpm.
Unfortunately the gurgling air noise continues BUT there is rarely any air in the vertical pipe with the valve, which remains hot throughout, either whilst the system is running or when the system is turned off.
There is no valve on this new pump to release air, and I need advice on how to rectify this matter and release the air. As I mentioned it occurs even when the hot water alone is on.
When either the hot water or the central heating is on there is a gurgling sound of air either in or very close to the vertical pipe with the valve. An engineer had to be called because air had got into the pump and it stopped working. He got it going. Following his departure the gurgling continued for three months until the pump stopped again. I have now had a new Grundfos pump installed and it is set to the maximum which is 45 rpm.
Unfortunately the gurgling air noise continues BUT there is rarely any air in the vertical pipe with the valve, which remains hot throughout, either whilst the system is running or when the system is turned off.
There is no valve on this new pump to release air, and I need advice on how to rectify this matter and release the air. As I mentioned it occurs even when the hot water alone is on.