Hot water problem

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Hi
We got a boulter oil boiler with a tank for the hot water; we also got on the system an open fire back boiler, both heat water and central heating. There is a vent valve by the hot tank and i used to have to bleed the hot tank every 2 months or i would not have any hot water, it now has become impossible and i got to bleed it every 3 weeks or no hot water and the bleed screw gets also clogged does not work very well, got to push a small nail in it before it works. Anybody got any ideas why increased air and blockage, can i put something on it which vents the air automatically?
hot tank vent.jpg
 
pipe1.jpgpipe 2.jpg
The best i can do, electric element not in use,the 3 pipes on the bottom pic are oposite the vent pipe
 
Hi
We got a boulter oil boiler with a tank for the hot water; we also got on the system an open fire back boiler, both heat water and central heating. There is a vent valve by the hot tank and i used to have to bleed the hot tank every 2 months or i would not have any hot water, it now has become impossible and i got to bleed it every 3 weeks or no hot water and the bleed screw gets also clogged does not work very well, got to push a small nail in it before it works. Anybody got any ideas why increased air and blockage, can i put something on it which vents the air automatically?
View attachment 24072
Hi
We got a boulter oil boiler with a tank for the hot water; we also got on the system an open fire back boiler, both heat water and central heating. There is a vent valve by the hot tank and i used to have to bleed the hot tank every 2 months or i would not have any hot water, it now has become impossible and i got to bleed it every 3 weeks or no hot water and the bleed screw gets also clogged does not work very well, got to push a small nail in it before it works. Anybody got any ideas why increased air and blockage, can i put something on it which vents the air automatically?
View attachment 24072
check out plumvent video shows what it is and how it works
 

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