I have an unvented system that constantly drops pressure. There are no visible leaks (3 years dropping) and a couple of so called plumbers have tried to no avail to fix it. I have to keep the filling loop slightly open to keep the pressure around 2 bar. If not it drops to zero within a day. My hunch is that it is leaking into the water tank, is this likely/possible? As there is no other leaks anywhere.
i dont think it will be leaking into it then matey ! the unvented cyliner is under a higher pressure [ prob 3bar ] so if there was a leak in the coil [causing the two to mix ]the cylinder water would push into the boiler system causing the boiler pressure to rise not fall !! understand me ?
what boiler do you have ?
matt
November 2008
Hi Matt
It is a Protea unvented system
Simon
November 2008
what type of cylinder do you have ... unvented mains pressure or tank feed [from loft etc] ?
matt
November 2008
Cheers for the quick response Matt
It is neither the underfloor (has been isolated) or the expansion outlet easily monitored. If it is leaking in the cylinder (as I suspect) would the hot water colour be tarnished as that is what the last plumber said?
Simon
November 2008
do u mean u have a sealed boiler system ? if you are losing pressure it can only be 3 things , a pipe/rad leaking [poss under the floor ], the relief pipe outside leaking or depending on the boiler model ,the boiler could be leaking internally
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