Lochinvar · Crest (FB / Hellcat FCB)
Lochinvar Crest FBN6001
The Crest FBN6001 tops the Crest FB line at 600 to 6000 MBH input with 5766 MBH gross output and a 5014 MBH AHRI net rating at 10:1 turndown, on 6" pipe with a 3" gas inlet.
Key figures
- Max input
- 6,000 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 600 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Crest FBN6001 in practice
The FBN6001 is the flagship of the Crest FB(N,L)0751-6001 range at 6.0 million BTU/hr — the top of the family the product page describes as running from 750,000 to 6.0 million BTU/hr. The I&O ratings table lists 600 to 6000 MBH input with 5766 MBH gross output and a 5014 MBH AHRI net water rating, at 10:1 turndown per the manual.
Water content reaches 304 gallons and weight with water 6,900 lb, the 6" pipe outlet and inlet continue from the 5001, and the gas inlet grows to 3" with 14" air and vent. Venting is in stainless steel, polypropylene, PVC or CPVC to 100 equivalent feet per the page feature list, on the wave fire-tube platform with the SMART TOUCH control and CON·X·US, and the family page prints the 10-year heat exchanger warranty.
Best suited to
- The largest central plants in the Crest FB range, near 6.0 million BTU/hr
- Projects with a 3" gas supply and 14" air/vent openings
- Plants comfortable with a 600 MBH minimum fire at the top of the line
Applicability and support
- Model number
- FBN6001
- 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 | 600 MBH | Per the I&O ratings table. |
| Heating input, maximum | 6,000 MBH | Per the I&O ratings table. |
| Output | ||
| Gross output | 5,766 MBH | Per the I&O ratings table. |
| Net AHRI water rating | 5,014 MBH | Per the I&O ratings table. |
| Venting and air | ||
| Air size | 14" | Per the I&O ratings table. |
| Vent size | 14" | Per the I&O ratings table. |
| Venting | Category IV sealed combustion; stainless steel, polypropylene, PVC or CPVC venting | Up to 100 equivalent feet per the Crest product-page feature list. |
| Physical and connections | ||
| Water content | 304 gal | Per the I&O ratings table. |
| Pipe outlet connection | 6" | Per the I&O ratings table. |
| Pipe inlet connection | 6" | Per the I&O ratings table. |
| Gas connection | 3" | Per the I&O ratings table. |
| Weight with water | 6,900 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 FBN6001's ratings?
600 to 6000 MBH of input with 5766 MBH gross output and a 5014 MBH AHRI net water rating per the I&O ratings table, at 10:1 turndown.
What connections does the FBN6001 use?
6" pipe outlet and inlet, a 3" gas inlet and 14" air and vent sizes, with a 304-gallon water content and 6,900 lb weight with water per the ratings table.
Questions about the Lochinvar Crest FBN6001?
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
- Lochinvar Crest FBN5001 vs FBN6001Comparison
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- Crest (FB / Hellcat FCB) series hub
- Buying guide
Sources and verification
- Lochinvar — Crest Condensing Boiler (FBN1001) model page · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.