Strange noise when water heats.

[LondonStone]

Hello,

Over the last few weeks I have noticed an odd gurgling, fizzing, shooshing noise comming from what seems to be inside my hot water cylinder tank. I'd describe it as the noise of a small wave receding on a pebble beach.

The central heating system is working perfectly, but the noise is a little worrying.

I have a Potterton Profile 80(or 800, know it's an 8 though) boiler. Two 2 port valves (1 for CH 1 for HW), a honeywell pump and a potterton EP2001 control panel.

It is a sealed system, and the enclosed red header tank in the loft is showing 1 bar of pressure.

There is a small radiator type bleed valve located between the pump and the motorized valve for the hot water. I keep bleeding this and seem to get a tiny amount of air every day, but the noise persists.

Can anyone suggest a simple way of checking there is no air in the heating pipes inside my water cylinder ? I'm guessing that's what the noise is. What else might it be?

Sorry for the long post, but wanted to put as much information as I thought would be useful.
Thanks for taking the time to read it and thank you in advance for your help.

 

[JPC]

has someone turned the immersion heater on ?

 

[LondonStone]

I pretty sure nobody has turned on the immersion heater, as there isn't one!

 

[LondonStone]

Does anyone else have any suggestiones please?

 

[Nige F]

That`s poetic....sounds like air, or one hand clapping don`t keep venting it .You`ll lose all the pressure in the system eventually........Just leave it until next service and ask about a automatic air vent in place of your man. one...No worries-- Basically....just micro- bubbles which can be notorious to remove.