Lochinvar re-defined the fire-tube boiler category with its KNIGHT® Wall-Mount and CREST® lines. For residential and light commercial applications, the FTXL™ adds models from 399,000 to 850,000 Btu/hr, and takes Lochinvar’s fire-tube technology to the next level. FTXL offers best-in-class AHRI Thermal Efficiency and footprints, plus remote connectivity that puts the SMART SYSTEM™ control at your fingertips, anywhere!

FTXL can operate over a wide range of flow rates* with very low pressure drop. This permits installation of a “full flow” (variable primary) system eliminating the time and materials cost of primary/ secondary piping, and pumps needed to maintain flow in a watertube boiler. Variable flow also makes FTXL more flexible at handling frequent fluctuations in the system flow rate.

  • – 5 models from 399,000 to 850,000btu/hr
  • – Up to 98% thermal efficiency
  • – Up to 10:1 turndown ratio
  • – *Flow rates from 10 to 150GPM

Additional information