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Lochinvar Boiler FTXL Fire Tube Boilers

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Lochinvar Hydronic heating Boiler Repair, maintenance, and replacement planning
Lochinvar FTXL Fire Tube Boilers product image

Technical Specifications

Product Specs

  • Brand: Lochinvar
  • Product family: FTXL Fire Tube Boiler
  • Equipment type: Boiler
  • Product group: Commercial hydronic heating
  • Representative model: FTX400L 121
  • Input range: 399,000 to 999,900 BTU/hr family
  • Thermal efficiency: up to 98% family
  • Turndown ratio: up to 10:1 family
  • Key feature: stainless steel fire tube heat exchanger
  • Official source: Lochinvar product page
  • Model or series: FTXL Fire Tube Boilers
  • System role: Hydronic heating equipment for hot-water heating systems
  • Application: Residential or commercial hydronic heating applications when model capacity is appropriate
  • Compatibility check: Verify fuel type, venting, electrical requirements, capacity, controls, and installation clearances.
  • Verified source: lochinvar.com

Useful troubleshooting details

  • Confirm the exact FTXL Fire Tube Boilers model number, serial number, capacity, voltage, refrigerant or fuel type, controls, and matched equipment.
  • Share current symptoms, alerts or error codes, recent maintenance, access notes, and whether the issue is urgent or planned.
  • For replacement planning, note comfort goals, existing equipment age, and any heat-pump, electrification, or rebate-related questions.

Service planning

How GreenFlow handles FTXL Fire Tube Boilers requests

1

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

2

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

3

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

4

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

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Our Happy Customers

Dev W.

I had a breakdown of my cooling system and Hanna at Green Flow responded to my request right away. They scheduled me same day. The team at Green Flow was easy to communicate with over phone and text. They kept me updated on delays on arrival of the...

Michael C.

always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day

Murali S.

HVAC technician was punctual, followed up well, completed quick repairs, ensured the issue was resolved, and provided helpful recommendations.

Anna F.

They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.

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