Over 3000 Forbes Marshall 3-pass wetback boilers are generating steam in plants across the globe. These boilers provide the driest steam possible from the least amount of fuel and floor space. The true 3-pass fully wetback design ensures low flue exit temperatures resulting in high thermal efficiency. Marshall B boilers are designed for easy maintenance and inspection. Hinge mounted front doors and rear lift-off doors give you clear and instant access. Every Marshall B boiler is manufactured with the latest submerged arc fabrication technology to ISO 9001, IBR standards. Every boiler is a complete the packaged unit, compact and occupies minimum floor space.