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Everyone's been terrific and patient, and it has really helped me crystallize my thoughts. One last question please: I noticed in the blurb on the Worcester CDi range, that it made a point of emphasising that all boilers in this range condense in BOTH central heating mode and DHW mode...

I go and talk to garages when I want to know about vehicle reliability, and I also talk to heating-spares suppliers about boiler reliability, but I also bear in mind that if, for argument sake, Worcester and Vailant have, say, 60% of the market, they could be selling a fair amount of those...

I don't think so; I think you can be totally assured of the impartiality of Which? They don't accept any advertisements at all - hence the relatively high cost of each mag when averaged out over the year. And I believe they go out and buy all the items under test rather than accept 'samples'...

Fortunately, the boiler is in a well-lit, boarded-out loft with unlimited, unhindered access. So a compact would be pointless and an unnecessary maintenance handicap. I get Which? magazine and I try to be somewhat circumspect over their recommendations (from experience). I also head...

Having tig welded both aluminium and stainless steel and so got a real feel for the much greater thermal conductivity of aluminium over stainless, I can understand why they would want to use an aluminium heat exchanger. However, whether an aluminium heat exchanger gives any measurable...

Sincere thanks. I know the Worcester Bosch Greenstar new CDi compact range possibly has not been around long enough to judge it fully, but do you feel this range also lags behind Vailant when it comes to reliability and build quality? Martin

Please tell me more; I'd very much welcome the benefit of your experience. In what ways are Vailant boilers generally better than WB's? Martin

UPDATE TO POSTING In my initial posting I said that, when stood next to the boiler, the thud/thump/bang sounded like unburnt gas suddenly catching light. Well, that must be what it is, because standing outside a few yards away from the vent, the noise is definitely an explosion - similar to...

I wonder if anyone has come across the following fault in a Ferroli Optimax 38HE combi? In central heating mode, some 30 seconds after the boiler first starts up, a motor/actuator can be heard to operate for just one second and then, 2 seconds after the motor stops there is often a loud...