AIr in hot water system

[nevmac]

I am hoping someone here can help me!
I seem to have air in my hot water system somewhere. It really causes a problem when using one of our power showers. The water dies and the motors start screaming as it struggles to get hot water.
We have a traditional vented system with a header tank.

I have tried draining the system.

Any help/ideas would be great!

Thanks.

 

[kevplumb]

how big is the storage tank

how is the pump connected to the cylinder

 

[doitall]

Sounds as though you're running out of water or it's not connected right.

 

[nevmac]

the hot water tank is 114 litres.
it used to work ok and even with a full tank it will happen very quickly.

 

[seco services]

its not connected to the vent pipe is it ?

 

[nevmac]

sorry karl, i am not sure what you mean. amateur plumber here....;->

 

[nevmac]

and yes one pump is connected to the cylinder and the other is connected to the water pipes that go to my main bathroom shower.

 

[seco services]

flow the hot from the shower where abouts is it connected to on the hot water cylinder pipework ?
is it a new install ?

 

[Onetap]

the hot water tank is 114 litres.
it used to work ok and even with a full tank it will happen very quickly.

How big is the cold water storage tank ( in the loft)?
Is the cold water storage tank filling up or does this happen after/during a long shower?
How high is the cold water storage tank above the cylinder?
What temperature is the hot water set at?
Is there a Surrey/Warix flange on the outlet at the top of the hot water storage cylinder?

 

[nevmac]

karl... i believe the top of the cylinder.
the ensuite is new but the bathroom has been refurbed and a pump fitted 2 years ago.

 

[nevmac]

onetap.
not sure, on capacity, i would say over 100 litres.
cold should fill up as and when needed.
cylinder is probably 4 foot below the tank.
the hotwater has something strapped to the side which shows 45 c
no flange at the top of the storage cylinder.

 

[seco services]

thats the cyl stat on the side of cyl should be set at about 60c.
i would supply the pump off a surrey flange rather than the dhw supply out of the cylinder.
its drawing the air in rather than going up the vent pipe which a flange will stop this happening.

 

[kevplumb]

View media item 14782

stop nicking my pics

 

[seco services]

View media item 14782

stop nicking my pics

 

[nevmac]

guys, should i be having one of those fitted to my cylinder @ the top?