HSB boilers are used in the petrochemical, textile, food, large building, gym and hospital industries. The steam capacity of these boilers is from 300 to 10,000 kg / h with a working pressure of 10 bar and is able to work with gas, diesel and dual-burner burners. The design of HSB boilers is based on the international standard B.S2790 as Wet Back, and after design, their prepared plan is approved by the standard institute.