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I do have one major problem - the installer did not leave me with a Benchmark logbook at time of installation. It would appear that this is a a key document. The only documents I have are the installer's invoice, Vaillant Advance's dated registered guarantee letter together with Terms and...

Recently had a Ecotec 825 which came with a 10 year warranty installed. I need to have the boiler serviced yearly to maintain the warranty. Can any Gas Safe guy do this or does it have to be a Vaillant approved one? Vaillant Advance are not answering my emails, so have little faith in them. I...