Airlock in hot water taps

[ScottJH]

I have a house with 1 upstairs bathroom and a detatched garage.

The bathroom has a mixer tap on the sink and also a mixer tap on the bath.

The bathroom sink tap also has a non return valve fitted to it.

The garage has seperate hot and cold water taps fitted.

My problem is that I continually get airlocks in the hot water, especially in the bathroom..

The only way to cure it is to run the hot water tap in the garage for about 1 minute and it splutters out the air and makes this tap and more importantly the 2 mixer taps in the bathroom run fine - for a while.

So, assuming the garage tap is the problem, any ideas how I fix it ?

I have a new system boiler fitted and it done this with the older system bolier also.

 

[Slugbabydotcom]

Air can only get sucked in at the vent.

This can be caused drawing too much water off at once ie more than one tap open and more to the point an inadequate feed from the storage tank to the cylinder and through the cylinder to where the vent tees in.
It may be undersized or partially blocked. the most common and easy to sort cause of this partial blockage is the gatevalve isnt open fully and the 2nd common is a blockage at the main tank outlet where it joins into this pipe.
In one case I came across back in 1982 someone had fitted an iron fitting in this pipe which rusted internally and caused a blockage

 

[ScottJH]

Air can only get sucked in at the vent.

This can be caused drawing too much water off at once ie more than one tap open and more to the point an inadequate feed from the storage tank to the cylinder and through the cylinder to where the vent tees in.
It may be undersized or partially blocked. the most common and easy to sort cause of this partial blockage is the gatevalve isnt open fully and the 2nd common is a blockage at the main tank outlet where it joins into this pipe.
In one case I came across back in 1982 someone had fitted an iron fitting in this pipe which rusted internally and caused a blockage

Where exactly do you mean when you mention "the vent" ?

 

[dextrous]

the vent is the big pipe that hangs over the top of the cold water tank.

 

[Slugbabydotcom]

The vent is the pipe which loops over the top of the Cold Water Storage tank

 

[dextrous]

snap

 

[buck51]

It could also be a partially blocked ball valve, not filling the tank fast enough,