Global Watertube Boiler Market Size by Boiler Type (2025–2032)

The global watertube boiler market recorded diversified demand across boiler configurations in 2025, with D-type boilers leading adoption due to their high thermal efficiency and suitability for large-scale industrial and power generation operations. Horizontal straight tube and O-type boilers also maintained strong demand, supported by widespread deployment across utility and heavy manufacturing facilities. Overall market performance remained stable, reflecting continued investment in industrial steam generation infrastructure. The horizontal straight tube boiler segment is estimated to reach USD 1,277.72 million in 2026, driven by upgrades to industrial boiler systems and the expansion of utility-scale projects.
The O-type boiler segment is expected to reach USD 1,597.52 million by 2029, while the D-type boiler segment is projected to expand to USD 3,294.13 million by 2032, supported by rising energy demand, expansion of thermal power capacity, and increased adoption of high-pressure boiler technologies. Growing emphasis on efficiency, reliability, and long-term operational performance continues to support demand across all boiler types globally.