Abstract: A superheated steam generator having superheating steam tubes and boiler tubes fluidly connected to a boiler, wherein the steam tubes and boiler tubes extend, intermediate of a heat source and the boiler. Localized insulation is located adjacent the superheating steam tubes and intermediate of the boiler and the heat source to reduce heat transfer to the boiler in the region of the superheating steam tubes. To prevent local roiling within the boiler, the thermal resistance of the local insulation and the superheating steam tubes is substantially equal to the thermal resistance of the boiler tubes.