Real Journeys chief executive Richard Lauder told passengers the Dunedin-built ''Lady of the Lake'' will be kept in service for another century, helped by another eight-week slipway survey next winter.
The Earnslaw travels 40,000km over 3500 hours on the lake every year.
Mr Lauder said the only coal-fired passenger-carrying steamship still in operation in the southern hemisphere will soon be ferrying passengers to a refurbished Colonel's Homestead at Walter Peak Station, with new gourmet barbecue and morning or afternoon tea menus, from December 1.