I've got a pressurised heating system, ie no header tanks with pressure
being provided by the mains water, which has a minor problem. The hot water
tank has a vent pipe (which is fitted with a temperature/pressure fitting)
which drips when the boiler is on.
I have looked on the web and found that these tanks should be vented
periodically by carrying out the following:
1.. Turn off feed to tank (mains).
2.. Open lowest hot tap.
3.. Open press/temp valve and leave open until glugging stops (several
4.. Turn on feed to tank (mains).
5.. Turn off hot tap.
I have done this and the dripping stopped for a couple of days but it has
now started again. Does anyone know how to resolve this problem as I cannot
understand how the air in the top of the tank is being displaced by water.