HS Code for Watertube boilers

Watertube boilers with a steam production capacity not exceeding 45 tonnes per hour are classified under HS code 8402.12. Heading 8402 covers steam or other vapor generating boilers (other than central heating hot water boilers capable also of producing low pressure steam). The classification within this heading is divided based on the technology used to generate steam and the output capacity. A watertube boiler is defined by its design where water circulates in tubes heated externally by fire or hot gases. This is distinct from fire-tube boilers where hot gases pass through tubes submerged in water. Subheading 8402.12 is specifically reserved for these watertube designs when their output is relatively low to medium scale (under 45t/h). This classification is critical for industrial machinery trade, as it distinguishes smaller industrial units from massive utility-scale boilers used in power plants. The technical specifications, including the steam output rate and the internal tube configuration, are the primary determinants for this code.

Products Included

• Small-scale industrial watertube steam boilers
• Package watertube boilers for manufacturing plants
• Watertube boilers with 20t/h steam capacity
• Biomass-fired watertube boilers under 45t/h
• Gas-fired watertube boilers for industrial processing

Common Misclassification

Watertube boilers are often confused with fire-tube boilers, which are classified under 8402.19. The internal flow of the medium (water in tubes vs. gas in tubes) is the deciding factor. Another common error is misclassifying based on capacity; if a watertube boiler exceeds 45 tonnes of steam production per hour, it must be moved to HS code 8402.11. Additionally, central heating boilers that do not generate high-pressure steam are excluded from this heading and are instead classified under heading 8403. Super-heated water boilers are also distinct and fall under 8402.20.

FAQ

What is the HS code for Watertube boilers?

For watertube boilers with a capacity not exceeding 45 tonnes per hour, the HS code is 8402.12.

How is steam production capacity measured for this code?

Capacity is measured in tonnes of steam produced per hour (t/h) at the boiler's maximum continuous rating (MCR).