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Agile says: The external apperance of the vessel fits this description more or less. It came as part of a package specified by the system designer. Nevertheless I have emailed 2 photographs for posting, the first showing the expansion vessel and the second showing the corossion which had...

Yes, the expansion vessel is on the potable side. And in addition: A good New Year to you all, in particular those who have been kind enough to take an interest in my obscure plumbing problems.

Agile says: Something is puzzling me about my present situation. Inhibitors were used in the heat store and central heating/boiler circuits - (perhaps not in sufficient quantity, as previously discussed.) However, surely damage could also have occurred on the domestic hot water side of the...

Thanks to bab for comments on isolation of cold water main into coil when not required. I shall probably do this. (Though might this not increase the possibility of cross contamination from the heat store to the domestic hot water? This is all getting a bit too complicated for my taste.) I...

Since the inhibitors in the cylinder will now be diluted and the pressure of water in the hotwater coil is greater than that in the cylinder (pressure in coil - 2 bar) I assume that there is very little risk of water passing in significant quantity from the tank to the coil. Added to this, the...

What is the simplest way to determine the PH of the supply? Indicator paper, I suppose, (where can I get some?) or perhaps the water company should be able to tell me this? By the way, I would value your comments on the need to isolate the Central Heating circuit in the present circumstances and...

There does seem to be an albion website but absolutely no contact information or technical helpline offered. I do have head office telephone numbers from literature I have on file for West Midlands, Manchester and Lincolnshire, but I am not bothering with these today. An email address would...

The cylinder is about 4 years old. I imagine all warranty is long out of date. I added an inhibitor at a fairly early stage. I don't remember the name or precise quantity, though I did add what seemed to be a reasonable dose. I did not however do exact calculations on the quantity of water...

Thanks Oilman for your clear commentary. The feed to the underfloor pipes from the heatstore is direct. A mixer valve combines returning water to the correct temperature for the return. Therefore there is no heat exchanger for this part of the system. I had assumed a single heat exchanger...

Thanks for your interest Tony. I have already tied up the float valve (having drained most of the water from the tank manually.). There was quite clearly not even the smallest drip entering the tank in this way. (The side of the tank below the float dried off. There were no drips onto the...

I have an Albion Mainsflow heatstore which provides hot water indirectly via a coil running through the store. Water is drawn directly from the store for under floor heating. In recent months I have noticed water coming from the over flow of the expansion/feed tank located above the heat...