Unvented water tank problem, help please

Joined
21 Mar 2008
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Location
Argyll
Country
United Kingdom
Hi,

The overflow pipe outside my house is running constantly. I have an unvented water tank and heating system, its a titan flowmaster 210l tank, the whole system is about 12 years old

There seems to be a constant feed of cold water entering the water tank, this is increasing the pressure and overflowing into the expansion vessel, which is pressurizing up to 3 bar and then releasing into the overflow (my best guess). The pressure gauge reads 3 bar all the time.

The only time i can stop the constant flow is when I turn off the cold water feed next to the tank, this stops the pressure rising in the expansion vessel, but means I have no water in the house or heating.

Does anybody have any ideas what the problem may be, and is it still ok to use the system until I can get a plumber out to have a look, proberbly Wednesday.

Thanks
 
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