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Hi, this is my first post on this forum so apologies if terminology etc is incorrect but running out of options with this problem before escalating to insurance to trace leak. To summarise
Worcester 30 CDI Classic Boiler, Albion Ultrasteel 180L Indirect tank, Zilmet ultra pro expansion tank. Both boiler and tank connect to the same copper expansion pipe just before going outside. This has been leaking water (enough to fill up a half pint glass over night).Boiler loses pressure every couple of hours (from 1.5bar to 0). Steps taken to date (via plumbers).
1. Initial thought was boiler fault, Worcester came out and replaced pressure valve. Subsequently isolated the boiler through the two valves underneath. Pressure remained static for 24 hours. Open the pipe and pressure drops to zero. Boiler passed as working fine.
2. Appears that the water coming through expansion pipe is coming from the tank - when water is heating, it's clear that water is flowing rapidly through the tundish. I have a plumber coming out to look at the 'external' expansion tank (Zilmet) as when pressing the valve on top, no water or air comes out (not sure if this indicates a problem).
3. No apparent signs of leaking coming from pipework in ceilings or walls, radiators checked (wrapped tissue around all valves). there is some pipework going under the kitchen floor which could be an issue but i am hoping this is a last resort.
My question is, can the issue around tank and/or expansion tank leaking through tundish be connected to the boiler pressure drop or is this simply coincidental? From my simple testing, there seems to be a direct link between topping up the boiler pressure and water flowing out of the expansion pipe (not the one from the boiler has i've checked this a number of times and it is dry). Local plumbers seem to doubt it.
Any help or guidance would be appreciated.
Thanks
Gareth
Worcester 30 CDI Classic Boiler, Albion Ultrasteel 180L Indirect tank, Zilmet ultra pro expansion tank. Both boiler and tank connect to the same copper expansion pipe just before going outside. This has been leaking water (enough to fill up a half pint glass over night).Boiler loses pressure every couple of hours (from 1.5bar to 0). Steps taken to date (via plumbers).
1. Initial thought was boiler fault, Worcester came out and replaced pressure valve. Subsequently isolated the boiler through the two valves underneath. Pressure remained static for 24 hours. Open the pipe and pressure drops to zero. Boiler passed as working fine.
2. Appears that the water coming through expansion pipe is coming from the tank - when water is heating, it's clear that water is flowing rapidly through the tundish. I have a plumber coming out to look at the 'external' expansion tank (Zilmet) as when pressing the valve on top, no water or air comes out (not sure if this indicates a problem).
3. No apparent signs of leaking coming from pipework in ceilings or walls, radiators checked (wrapped tissue around all valves). there is some pipework going under the kitchen floor which could be an issue but i am hoping this is a last resort.
My question is, can the issue around tank and/or expansion tank leaking through tundish be connected to the boiler pressure drop or is this simply coincidental? From my simple testing, there seems to be a direct link between topping up the boiler pressure and water flowing out of the expansion pipe (not the one from the boiler has i've checked this a number of times and it is dry). Local plumbers seem to doubt it.
Any help or guidance would be appreciated.
Thanks
Gareth