HARARAT GOSTAR Heat Exchangers are instantaneous type, designed to heat liquids with either water or steam. Heat Exchangers can be used for many other heating and cooling applications. Heat Exchangers are suitable for use with any type of boiler or system when installed in accordance with the manufacture's recommendations. Boiler rating should be checked to assure sufficient capacity to handle the load imposed by the Heat Exchanger. Heat Exchangers are available in 2, 4 or 6 pass construction, can be selected from this Bulletin for lengths up to 10 feet and shell diameters through 30 inches. Consult HARARAT GOSTAR for 6-pass* construction, lengths in excess of 10 feet, and/or materials of construction other than listed herein. Our advanced production machinery, including automatic welding machines, Head forming equipment, Flanging machine, Dishing Unit, rollers, and plasma cutters mean that production to the highest possible quality levels is assured.