The product range includes vertical and horizontal natural circulation and vertical once-through waste heat boilers in 9H, 9F, 9E, 6F, and 6B grades. These boilers are suitable for various gas turbine fuels, such as natural gas, blast furnace gas, crude oil, heavy oil, light oil, etc. The waste heat boilers can be equipped with additional systems, including: Reburning System; Flue Gas Bypass System (for single-cycle to combined-cycle service); SCR System; Online Lifetime Monitoring System (BSE System); Blow-off System; Offline Cleaning System for Heat Transfer Surfaces.