I have yet to find the same service of "servicing" a boiler beit electric or gas, here in Turkey as that of the UK; ours is serviced by the "Baymark" engineer we still dont get a certificate, just a bill of 20-30TL.
Is the maintenance company sending out a qualified gas or electricity engineer? or just sending out one of their employees from the office to "flick" a switch or 2?
And in answer to your question should one be sent out to an appliance less than a year old, that is up to you. warranties are as good as the builder who fitted it, if it breaks down in that year will they fix it? some do some dont.