The heat-exchange equipment is designed for the nuclear electric power plants (NEPP) that is based on use of new heat-exchange surfaces, consisting of preliminarily assembled heat-exchange modules in the form of involute W-shaped or L-shaped screens, with tube ends fixation in the vertical cylindrical collectors. The design of integrated water heaters is presented. The heat-exchange surface in both the heaters was made of the steel 08Kh12N10T. The heaters size can be decreased in application of the steel 08Kh14MF.