Lochinvar · Crest (FB / Hellcat FCB)
Lochinvar Crest FCB1500
The Crest with Hellcat FCB1500 fires 60 to 1500 MBH with 1443 MBH gross output and a 1252 MBH AHRI net rating, stepping the Hellcat line to 4" pipe and 8" air and vent.
Key figures
- Max input
- 1,500 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 60 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Crest FCB1500 in practice
The FCB1500 is the second rung of the Crest with Hellcat range: the I&O ratings table lists 60 to 1500 MBH input with 1443 MBH gross output and a 1252 MBH AHRI net water rating, matching the Crest FB1501 ratings row. It is the first FCB size on 4" pipe outlet and inlet, with the gas inlet at 1-1/2" and air and vent both 8".
Water content is 94 gallons and weight with water 2,307 lb per the ratings table. The Hellcat combustion system with RealTime O2 Trim and the 10" capacitive touchscreen control distinguish the line, and venting is room air/direct vent or common vent in stainless steel, polypropylene, PVC or CPVC to 150 equivalent feet per the page feature list.
Best suited to
- Commercial loads between 1,000 and 1,500 MBH on the Hellcat platform
- Projects stepping to 4" boiler piping with an 8" air/vent envelope
- Plants that want the Hellcat's O2 trim across a 1.5 million BTU/hr ceiling
Applicability and support
- Model number
- FCB1500
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Lochinvar. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Heating input, minimum | 60 MBH | Per the I&O ratings table. |
| Heating input, maximum | 1,500 MBH | Per the I&O ratings table. |
| Output | ||
| Gross output | 1,443 MBH | Per the I&O ratings table. |
| Net AHRI water rating | 1,252 MBH | Per the I&O ratings table. |
| Venting and air | ||
| Air size | 8" | Per the I&O ratings table. |
| Vent size | 8" | Per the I&O ratings table. |
| Venting | Category IV sealed combustion; room air/direct vent/common vent in stainless steel, polypropylene, PVC or CPVC | Up to 150 equivalent feet per the Crest with Hellcat product-page feature list. |
| Physical and connections | ||
| Water content | 94 gal | Per the I&O ratings table. |
| Pipe outlet connection | 4" | Per the I&O ratings table. |
| Pipe inlet connection | 4" | Per the I&O ratings table. |
| Gas connection | 1-1/2" | Per the I&O ratings table. |
| Weight with water | 2,307 lb | Per the I&O ratings table. |
Manuals
Alerts documented for this model
- Gas Pressure SW Open
- Low Water Cutoff Open
- Blocked Drain SW Open
- APS Open
- Anti-cycling
- Flame Failure
- Flame Fail Running
- Gas Valve / Relay Failure
- Auto Reset High Limit
- Manual Reset High Limit Open
- Fan Speed Low
- Fan Speed High
- Louver Proving Sw Open
- Flue Temp High
- Delta T High
- Outlet Temp High
- Parameter Programming Complete
- Sensor Open
- Sensor Shorted
- Flue Sensor Open
- Flue Sensor Shorted
- Too Many Resets - Try Later
- Internal Fault
- Flue Temp Shutdown
- Delta T Shutdown
- Outlet Temp Shutdown
- Writing/Programming EEProm Error
- CRC Parameter Error
- Wrong Error Code
- Flame Sense Out of Sequence 1
- Flame Sense Out of Sequence 2
- Flue Damper Switch Open
- IO Expander Out Error
- Failure ADC Controller
- Outlet Sensor Differential
- Flue Sensor Differential
Frequently asked questions
What are the FCB1500's ratings?
60 to 1500 MBH of input with 1443 MBH gross output and a 1252 MBH AHRI net water rating per the I&O ratings table.
What connections does the FCB1500 use?
4" pipe outlet and inlet, a 1-1/2" gas inlet and 8" air and vent sizes, with a 94-gallon water content and 2,307 lb weight with water per the ratings table.
Questions about the Lochinvar Crest FCB1500?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Compare and explore
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- Crest (FB / Hellcat FCB) series hub
- Buying guide
Sources and verification
- Lochinvar — Crest with Hellcat (FCB4000N) model page · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.