When the Vokera man serviced my old boiler I asked him what conditionthe 20 year old heat exchanger was in. he said it was fine and he told me the usual reason the heat exchangers failed was because of pressure fluctuations gradually causing metal fatigue as the thing flexed. When people let the accumulator run out of air the fluctations got bigger (hot/cold expansion) leading to rapid fatigue and failure.
So this set me thinking - would it extend the life of the heatex to add a bigger accumulator to reduce the hot/cold pressure fluctations?
has anyone else heard this or is it another urban myth that these repairmen tend to carry (the previous guy assured me I shoud leave all the TRVs on maximum all the time for max efficiency).
Robert