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OK sorted - The Heater Tank overflow was frozen solid. Got on my extension roof where it vents out and a pile of pipe shaped icicles had dropped out. Not a drop from the system now - I'm still curious as to why the Relief valve was dripping. The Mains inlet vents through the valve and joins...

It says 6 bar on the top of it Ian? This may be a better shot of it: Its dripping from the thread where that arrow is. It was fine this morning until I turned the Hot Water on and the Water Heater Tank was obviously demanding water.....I then also get the feed that also routes into the...

OK update - Ian - I am a bit of a novice at this.... After much web browsing it seems what I was looking at was not as described. Returned home to work last night. The Tundish is continuing to fill however I can now see that the pipework that carries on from below the Tundish and carries on...

Thanks Ian - I'll let you know what I find!

Cheers anyway Ian. I'm wondering if the Boiler is connected to the outlet and forcing water upwards? I did have to re-pressurise the Boiler the other week though its sat at the correct pressure according to the manual on the gauge. The only thing I can think of is the overflow outlet is frozen...

Hi Yes - its an Unvented Heater System - Excelsior Model 175? Not sure if it tells me anywhere about the air bubble. Any idea where / how I can find out how to do? Surely if there was a need to add an air bubble this would be indicated but overflow being seen dripping down into the Tundish? This...

Hi all - went to switch on my central heating this morning and could hear a drip from my Hot Water Tank area. What appears to be the pipe running down from the Pressure Release Valve has an inline Tundish. This seem to be filling UP with water? Dripping down I would have expected it to be the...