Could these be air vents?

[Dan Robinson]

1m below the tank would make more sense. Otherwise there is no head of water to push the air out. Nothing will work if installed above the water line in the tank.

Having it too low (and on the inlet side of the pump) will actually cause more air to come in the system.

 

[amfisted]

Thanks, Dan. Thinking about it, of course it needs a head of water to push the air out. I must have read that other advice wrongly, and me, an ex firefighter who was taught basic hydraulics. No wonder all those fires wouldn't go out.

Being manual then obviously the existing vents wouldn't cause a problem unless physically opened. Other than checking the direction of the arrow on the pump and following the pipework to the vents, is there any other way of telling which direction the water is going?

 

[Dan Robinson]

Flow pipe gets hot first.

 

[amfisted]

Thank you. Again, its obvious when you think about it.

 

[amfisted]

Well, I had another look and I've no idea how I managed to remember that there was just 6 inches between bottom of tank and valve. Its at least 1m, but what's 33 inches between friends? So I have the head, I'm going to cut out the manual valve and put in an isolator (having read that the Screwfix AAVs have a tendency to leak) then fit my vent and hey presto..hopefully not back on here tomorrow or Thursday to ask why the system isn't running quietly again.

 

[Dan Robinson]

Use decent lever valves not crappy slotted ones.

 

[D_Hailsham]

read that the Screwfix AAVs have a tendency to leak

Then get a Flamco Flexivent, which can be removed for cleaning without draining down.

 

[Dan Robinson]

Before or after that leaks?

 

[D_Hailsham]

10 years and still waiting for mine to leak.

 

[Terrywookfit]

http://www.google.co.uk/url?sa=t&rc...=D2ARNNEVpCWaiW2AOFKJGg&bvm=bv.99804247,d.ZGU

 

[St0rmer66]

I would suggest that even though they're "auto" air vents that you don't leave them open permanently on an open system. More likely to leak that way.

 

[St0rmer66]

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CEYQFjAAahUKEwjywsjE7bLHAhWpFtsKHbSeBxI&url=http://www.honeywelluk.com/products/Valves/EA122/&ei=90LTVbLrEqmt7Aa0vZ6QAQ&usg=AFQjCNGdrS8TEXrJxKR8XuIuExIRBlUD7w&sig2=D2ARNNEVpCWaiW2AOFKJGg&bvm=bv.99804247,d.ZGU

I've definitely replaced those before because of leaking.

 

[Dan Robinson]

If you're feeling flush, try these:

http://www.jtmplumbing.co.uk/water-...q-s1qTIqqpLrD-_c9G9hB-XptLBLsBk_WcaArYT8P8HAQ

 

[Terrywookfit]

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CEYQFjAAahUKEwjywsjE7bLHAhWpFtsKHbSeBxI&url=http://www.honeywelluk.com/products/Valves/EA122/&ei=90LTVbLrEqmt7Aa0vZ6QAQ&usg=AFQjCNGdrS8TEXrJxKR8XuIuExIRBlUD7w&sig2=D2ARNNEVpCWaiW2AOFKJGg&bvm=bv.99804247,d.ZGU

I've definitely replaced those before because of leaking.

But at least they can be turned off and cleaned. They are far more reliable than the cheap brass ones!

 

[St0rmer66]

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CEYQFjAAahUKEwjywsjE7bLHAhWpFtsKHbSeBxI&url=http://www.honeywelluk.com/products/Valves/EA122/&ei=90LTVbLrEqmt7Aa0vZ6QAQ&usg=AFQjCNGdrS8TEXrJxKR8XuIuExIRBlUD7w&sig2=D2ARNNEVpCWaiW2AOFKJGg&bvm=bv.99804247,d.ZGU

I've definitely replaced those before because of leaking.

But at least they can be turned off and cleaned. They are far more reliable than the cheap brass ones!

No, I mean I turned the black part and the whole thing started leaking. Not just the little vent.