The Lochinvar CREST Boiler has Hellcat Combustion Technology and RealTimeO2 trim, which results in a targeted combustion O2 thanks to its reliable combustion system. There is also a trim so that the user can add their preferred O2 setting.

Direct Vent & Enhanced Controls

The CREST boiler has a 150 foot direct vent and now features a 10” touchscreen for easier usability and better visibility. The touchscreen also has updates and enhancements to protocol.

New Look & Turndown Increase

This Lochinvar boiler has smaller front doors and strong but light side panels. This makes it easier to fit in small spaces and is more compact for moving panels.

Some models (FCB4000 – FCB6000) have 20:1 turndown.


The CREST Condensing Boiler has Lochinvar’s SMART TOUCH control, which modifies based on changes in temperature. There is also the O2 sensor system that is designed specifically for a condensed boiler.

Features of the Hellcat Combustion Technology

The Hellcat combustion technology features both an air filter box and an air damper, a boiler control panel, a comfort control panel, and an O2 sensor (exclusive to Lochinvar) and gas damper.

The air filter keeps particles from getting into the burner, while the damper provides air supply control. The gas damper, meanwhile, provides specific control to the fuel supply separately from the air supply. The boiler control panel has the O2 sensor board, the combustion feedback board, and the boiler control board, and the comfort control panel has terminal blocks that are pluggable and the BACnet integrated circuitry.

Integrated Controls Platform

The Lochinvar CREST boiler has five boards on its control platform:

  • Boiler Control Board
  • Combustion Feedback Board
  • Comfort Control Board (with low feedback connections)
  • O2 Sensor Board
  • Pump Board

The boards have fault indicators and LED status that will help with diagnoses. There have been other changes made to the Lochinvar CREST boiler, which include: a single boiler control taking safety measures.

The control boards are interchangeable, so the universal board can be used in case of replacement.

New Features

There are new features included with the boiler control board, which includes:

  • Air filter switch input
  • Blocking report (identifies the most recent blocking code and when it happened)
  • LED Indicator lights to help with troubleshooting
  • Lockouts that now log the burner state (an example is if lockout occurs during flame stabilization)
  • Recycling Report (helps in situations where recycling happens but lockout doesn’t)
  • Two gas pressure switch inputs (can now tell which switch has locked out)

Lochinvar CREST Boiler Venting Options

The boiler features six different venting options, which controls direct-vent air intake and more. Multiple units can be common-vented.

Parts of the Condensing Boiler - Room Air Vertical, Room Air Sidewall, Direct-Vent Sidewall, Common-Vent, Direct-Vent Vertical, and Direct Vent Vertical w/ Sidewall Air.

Features of the SMART TOUCH

Standard Features

  • Hellcat Combustion Technology featuring RealTime O2 Trim™
  • Low NOx Operation
  • Proof of Closure Valve (FCB 6000)
  • Low Gas Pressure Operation
  • Modulating Burner with up to 25:1 Turndown
  • Direct-Spark Ignition
  • Air Inlet Filter
  • Sealed Combustion
  • Vertical and Horizontal Direct Venting
    • Direct Vent up to 150 Feet
    • PVC, CPVC, Polypropylene or AL29-4C (FCB 1000-4000)
    • AL29-4C (FCB 1000-6000)
  • ASME “H” Stamped Heat Exchanger
  • 316L Stainless Steel Fire Tubes
  • 160 psi Working Pressure
  • On/Off Switch
  • Adjustable High Limit with Manual Reset
  • Low Air Pressure Switches indicate Blocked Vent/Air
  • Low Water Cutoff with Manual Reset & Test
  • High & Low Gas Pressure Switches w/ Manual Reset
  • Outdoor Air Sensor
  • Condensate Trap w/ Blocked Drain Switch
  • System Sensor
  • Drain Valve
  • Inlet & Outlet Temperature Sensors
  • Low-Voltage Terminal Strip
  • High-Voltage Terminal Strip
  • Downstream Gas Test Cocks
  • 50 psi ASME Relief Valve
  • Zero Clearances to Combustible Materials
  • Temperature & Pressure Gauge
  • SCCR of 5,000 A
  • Lifetime Thermal Shock
  • 10-Year Limited Warranty
  • 5-Year Warranty on Burner
  • 18-Month Warranty on Parts
  • See Warranty for Details


  • CON·X·US Remote Connect
  • Built-in Cascading Sequencer for up to 8 Boilers
  • SMART TOUCH Touchscreen Operating Control
  • Full-Color 10″ Capacitive Touchscreen LCD Display
  • Lead/Lag Cascade
  • Built-in Redundancy
  • Cascade Multiple Sized Boilers
  • Efficiency Optimized Cascade
  • Front-End Loading Capability with Copper-Fin II® and Power-Fin® Boilers
  • Building Management System Integration
  • with 0-10 VDC Input
  • BACnet MSTP Communications
  • Outdoor Reset Control with Outdoor Air Sensor
  • Password Security
  • Freeze Protection
  • DHW tank piped with priority in the boiler loop
  • DHW tank piped as a zone in the system with the pumps controlled by the Smart System
  • DHW Modulation Limiting
  • Separately Adjustable SH/DHW Switching Times
  • Low Water Flow Safety Control & Indication
  • Inlet & Outlet Temperature Readout
  • Domestic Hot Water Prioritization
  • Data Logging
  • Service Reminder
  • Time Clock
  • Data Logging
    • Hours Running, Modulation Rate
    • Ignition Attempts
    • Last 10 Lockouts with Burner State
    • Recycling Reporting
  • Programmable System Efficiency Optimizers
    • Night Setback
    • Anti-Cycling
    • Outdoor Air Reset Curve
    • Ramp Delay
    • Boost Temperature & Time
    • Modulation Factor Control
  • Pump Control Board (24V) with LED Indicators
    • System Pump
  • Boiler Pump
    • Domestic Hot Water Pump
    • DHW Recirculation Pump (Future)
    • Bypass Pump (Future)
  • >High-Voltage Terminal Strip
    • 120V/1PH/60Hz (FCB 1000-2000)
    • 208V/3PH/60Hz (FCB 2500-3000)
    • 480V/3PH/60Hz (FCB 4000-6000)
  • Low-Voltage Terminal Strip
    • 24 VAC Auxiliary Device Relay
    • Auxiliary Proving Switch Contacts
    • Alarm on Any Failure Contacts
    • Runtime Contacts
    • DHW Thermostat Contacts
    • Unit Enable/Disable (Demand) Contacts
    • System Sensor Input
    • DHW Tank Sensor Contacts
    • Outdoor Air Sensor Contacts
    • Cascade Contacts
    • 0-10 VDC BMS External Control Contact
    • 0-10 VDC Variable Speed Boiler Pump
    • Control Contact
    • 0-10 VDC System Pump Speed Input Contact
    • Flow Switch/Low Water Cutoff Contact


  • ASME Relief Valve Option:
    • 75 psi 100 psi 125 psi 150 psi
  • BMS Gateway – BACnet IP or LonWorks
  • Modbus Communication
  • Condensate Neutralization Kit
  • Alarm on Any Failure
  • FCB 2500-6000
    • 100,000 A
    • 200,000 A
  • Short Circuit Current Rating (SCCR) Options:
    • Variable Speed Boiler Pump
  • Motorized Isolation Valve
  • Common Vent Damper Kits
  • Wireless Outdoor Temperature Sensor
  • Electrical Transformer Options (Shipped Loose):
  • FCB 1000-2000
    • 208V/3PH/60Hz → 120V/1PH/60Hz
    • 480V/3PH/60Hz → 120V/1PH/60Hz
    • 600V/3PH/60Hz → 120V/1PH/60Hz
  • FCB 2500-3000
    • 480V/3PH/60Hz → 208V/3PH/60Hz
    • 600V/3PH/60Hz → 208V/3PH/60Hz
  • FCB 4000-6000
    • 208V/3PH/60Hz → 480V/3PH/60Hz
    • 600V/3PH/60Hz → 480V/3PH/60Hz


  • ANSI Z21.13/CSA Certified
  • ASME Certified, “H” Stamp / National Board
  • Qualified (FB 1000-2000)
  • CSD1 / Factory Mutual / GE Gap Compliant
  • South Coast Air Quality Management District
  • Canadian Registration Number (CRN)
  • California Code Compliant

CREST Boiler Specifications & Dimensions

Dimensions for the CREST Boiler.






Crest Heating Boiler Dimensions and Specifications

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We distribute boilers and water heaters for Lochinvar. Contact us for more information.