Lochinvar FTXL™ Stainless Steel Fire Tube Boiler, 2" Supply/Return, 85 to 600 MBH, 97.5% Thermal Efficiency, Natural Gas, Floor Mount, Induced Draft/Direct Vent

  • Brand: Lochinvar®
  • Type: Condensing, High Efficiency, Hot Water, Modulating
  • Applicable Standard: AHRI, ASME H, CSA, DOE
  • Gas Type: Natural
  • Gas Connection: 1 Inch
  • Mounting Type: Top Mount
  • Pressure Rating: 160 psi
  • DOE Heating Capacity: 600000 BTU/Hour
  • AGA Input Rating: 85 to 600 MBH
  • AFUE Rating: 97.5 Percent
  • Air Inlet Connection: 4 Inch
  • ASME Code: Yes
  • Boiler Dimensions: 26-1/4 Inch Length x 22-1/2 Inch Width x 53-1/2 Inch Height
  • Boiler Height Including Draft Hood: 65-1/2 Inch
  • Burner Type: Low Nox, Micrometal Fiber, Modulating
  • GPH Recovery: 29 GPM at 40 Deg F
  • Ignition Type: Direct Spark
  • Relief Valve Details: 50 PSI ASME 3/4 Inch Relief Valve, 697 MBH
  • Return Connection: 2 Inch Threaded
  • Supply Connection: 2 Inch Threaded
  • Tankless Heater Capacity: 15 to 105 GPM
  • Vent Size: 4 Inch
  • Venting Type: Vertical and Horizontal Direct Vent
  • Warranty: 10 Year Limited
  • Water Content: 12 Gallon
  • Features and More


  • Smart System™ Operating Control and Con-X-Us® Remote Connect Capable
  • FTXL Offers Best-In-Class AHRI Thermal Efficiency and Footprints, Plus Remote Connectivity that Puts the Smart System™ Control at Your Fingertips, Anywhere
  • Reduce Installation Cost with Variable Flow Technology-FTXL can Operate over a Wide Range of Flow Rates with Very Low Pressure Drop
  • This Permits Installation of a Full Flow System Eliminating the Time and Materials Cost of Primary/Secondary Piping and Pumps Needed to Maintain Flow in a Water Tube Boiler
  • Variable Flow also Makes FTXL More Flexible at Handling Frequent Fluctuations in the System Flow Rate
  • Smooth-Running, Modulating Combustion-FTXL Boilers have a Top-Mounted, Micrometal Fiber Burner with a Blower/Gas Valve Assembly that Drives Heat Energy Downward, Through Stainless Steel Fire Tubes, With Exhaust Venting through the Bottom of the Unit. a Modulating System Runs Smoothly and Efficiently, Without Frequent On/Off Cycling
  • Minimum Supply Pressure, Installer-Friendly-FTXL Operates with Supply Gas Pressure as Low as 4 Inch Water Column
  • Negative Regulation Draws Gas into a Pre-Mix Combustion System, Instead of Relying on Utility Pressure through the Gas Valve
  • The Result is Steady Operation in Low Gas Pressure Systems or When Peak Demand Occurs on Gas Supply
  • Automatic Fan Speed Control Fine-Tunes the Correct Fuel/Air Ratio Entering the Burner, Providing Superior Combustion Throughout the Entire Operating Range
  • Wireless Outdoor Sensor
  • Energy Star® Rated
  • Made in USA


    Smart System Digital Operating Control, Loch-N-Link USB Thumb Drive Port for Easy Programming, Cascading Sequencer with Built-in Redundancy, Four-Pump Control, Building Management System Integration, Programmable System Efficiency Optimizers, Stainless Steel Fire-Tube Heat Exchanger, Data Logging