Lochinvar · Crest (FB / Hellcat FCB)
Lochinvar Crest FBN2001
The Crest FBN2001 fires 80 to 1999 MBH with 1923 MBH gross output and a 1699 MBH AHRI net rating at 25:1 turndown, closing the 25:1 band of the FB line.
Key figures
- Max input
- 1,999 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 80 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Crest FBN2001 in practice
The FBN2001 is the largest of the Crest sizes with 25:1 turndown: the I&O ratings table lists 80 to 1999 MBH input with 1923 MBH gross output and a 1699 MBH AHRI net water rating, and the manual assigns 25:1 turndown to the 1501-2001 models. Its 111-gallon water content and 2,570 lb weight-with-water sit at the top of the 4"-pipe family.
Connections match the 1501 and 1751: 4" pipe outlet and inlet, 1-1/2" gas inlet and 8" air and vent. Venting is in stainless steel, polypropylene, PVC or CPVC to 100 equivalent feet per the page feature list, and the boiler runs the wave fire-tube platform with the SMART TOUCH control and CON·X·US from the Crest family page.
Best suited to
- Commercial loads approaching 2,000 MBH on a single boiler
- Plants that want 25:1 turndown at the largest FB size that offers it
- Projects with 4" piping and 8" air/vent already designed in
Applicability and support
- Model number
- FBN2001
- 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 | 80 MBH | Per the I&O ratings table. |
| Heating input, maximum | 1,999 MBH | Per the I&O ratings table. |
| Output | ||
| Gross output | 1,923 MBH | Per the I&O ratings table. |
| Net AHRI water rating | 1,699 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; stainless steel, polypropylene, PVC or CPVC venting | Up to 100 equivalent feet per the Crest product-page feature list. |
| Physical and connections | ||
| Water content | 111 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 | 2,570 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 FBN2001's ratings?
80 to 1999 MBH of input with 1923 MBH gross output and a 1699 MBH AHRI net water rating per the I&O ratings table, at 25:1 turndown.
Which Crest FB models share the FBN2001's connections?
The 1501, 1751 and 2001 all use 4" pipe outlet and inlet with a 1-1/2" gas inlet and 8" air and vent; they differ in capacity, water content and weight.
Questions about the Lochinvar Crest FBN2001?
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 FBN2001 vs FBN2501Comparison
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- Lochinvar Crest FBN1001Same series
- Lochinvar Crest FBN1251Same series
- Lochinvar Crest FBN1501Same series
- Lochinvar Crest FBN1751Same series
- Lochinvar Crest FBN2501Same series
- Lochinvar Crest FBN3001Same series
- Lochinvar Crest FBN3501Same series
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- Lochinvar Crest FCB1500Same series
- Lochinvar Crest FCB2000Same series
- Lochinvar Crest FCB2500Same series
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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.