andsam said:New type of ht/ex , forgot what they call it . It has a plastic coating and the flue comes out of the top this will stop the prob of leaking flue hood.
chrishutt said:CorgiIOW, do you remember this thread where we discussed the problem of condensate leakage from Vaillant heat exchangers? I think it might help.
gasgeezer said:As i mentioned previousley it is the same flue adaptor as the glow-worm XI range. They have now changed the seal and adaptor depending on age you may get it replaced on warranty as it is a known boiler fault.Also they usually fit a low water pressure switch at the same time.
From my limited experience of this problem, I think that leakage mainly occurs when large volumes of condensate are formed, i.e. when burner is on high flame but return water is relatively cold. Perhaps more likely to occur with high thermostat setting and when system water is cold.corgiIOW said:yet i worked that boiler hard for at least an hour yesterday with no sign of any leaks.
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