Coil Type AquaTube Steam Boiler

The Coil Type AquaTube (AQT) steam boiler with flexible tubes offers an O-type construction with gas-tight, welded steel inner casing, water-cooled rear wall, staggered bent-tube convection section, ceramic wool front wall and optional integrated finned tube economizer. Applications include high- and low-pressure steam, and thermal liquid.

Customers include manufacturing and processing facilities, pulp and paper, petrochemical, pharmaceuticals, hospitals, universities and ethanol plants.


  • Capacities: 100 BHP to1,200 BHP
  • Design pressures:15 psig to 650 psig
  • Radiant and convective super heaters with temperatures up to 750ºF
  • Two-pass flue gas contact with staggered tube arrangement for maximum heat transfer
  • Superior steam quality using proprietary separation technology with a large steam drum
  • Fuel: Natural gas or no. 2 oil
  • Meets or exceeds NOx emission standards while providing high turndown ratio
  • Natural boiler water circulation eliminates the need for a circulating pump
  • Integrated economizer provides efficiency to 85% when firing natural gas with a feed water temperature of 180°F 


  • High efficiency provides significant fuel savings
  • Low installation and maintenance costs
  • Reliable source of high-quality, dry saturated steam up to1ppm
  • Extensive capacity range and excellent long-term reliability ideal for commercial, industrial and institutional applications
  • Quick load response
  • Low operating costs with reduced maintenance costs
  • Boiler system components (burner, controls, economizer and emissions options) designed specifically for ease of operation