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Unilux Watertube Boilers

Built for versatility, Unilux boilers offer one of the widest standard size ranges available—making them a reliable solution wherever hot water is required.

Unilux Watertube Boilers

Multipass Flexible Watertube Boilers

  • Hot water, low-pressure steam, or high-pressure steam

  • Flexible burner selection

  • Useable heated water in under 15 minutes

  • Easy access to boiler controls for safety and serviceability

  • Easy fireside access for inspection and service

  • Available as field-erect (FE) units that don’t require on-site welding (ASME Section I and IV)

  • Industrial grade materials throughout

  • 25-year standard warranty against thermal shock damage


Unilux boilers have the greatest size range of standard product available in this design and can be used wherever heated water is required. Their robust construction, using SA 178 Grade “A” material and 1.5″ OD tubes, ensures long-term reliability, with a standard design pressure of 160 PSI and options for higher pressures. Unilux boilers are also highly serviceable—featuring easy-access panels, face-mounted controls, and a tube replacement process that requires no welding or rolling, making maintenance fast and straightforward.

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