I have a Vokera Synergy 29 condenser boiler and have had problems since it was installed 2.5 years ago.
The original heating system in the house was fitted with plastic pipes and eventually I needed to replace the radiators which had become so contaminated with sludge that they could not be cleared. I decided at the same time to have the boiler replaced and the pipework replaced with copper pipes to avoid the problem recurring.
Initially. the boiler would lose pressure over a 4 week period dropping from 1.5 to 0.3 on average. I gave up trying to get the installer to correct the problem and rather than take him to court, I gave up when the pressure held for about 3/4 months at a time.
Since this heating season started, the problem has got worse. In October, the system was needing topped up every 2 weeks. It now needs topped up every day when the pressure has dropped from 1/1.5 to virtually 0.
I have been under the boards a few times and can find no trace of a leak. What I have discovered is that the installer did not replace all the heating pipes with copper and has left a significant number of the original plastic pipes in place under the boards and has connected new plastic coated copper pipes to these then to the radiators.
There is no trace of water being released through the small pipe outside the house and, as I say, although there are traces of green tarnishing on some of the older joints, they all seem sound.
Any help would appreciated on this as it is now driving me crazy.
