Lochinvar · Crest (FB / Hellcat FCB)
Lochinvar Crest FBN1001
The Crest FBN1001 fires 50 to 999 MBH with 961 MBH gross output and an 834 MBH AHRI net rating — the 96.2% thermal efficiency model whose page opens the Crest FB line, at 20:1 turndown.
Key figures
- Max input
- 999 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 50 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Crest FBN1001 in practice
The FBN1001 is the default model page for the Crest FB line and the size whose spec block Boilers.ca quotes: the page headlines 96.2% thermal efficiency (the spec block prints 96%) with an ENERGY STAR rating, an ASME H stamp, a 10-year heat exchanger warranty and a 77-gallon nominal capacity. The I&O ratings table lists 50 to 999 MBH input with 961 MBH gross output and an 834 MBH AHRI net water rating, at 20:1 turndown per the same manual.
Connections are 3" pipe outlet and inlet with a 1-1/4" gas inlet, and the air and vent sizes are 6"; the page lists stainless steel, polypropylene, PVC and CPVC vent materials with venting to 100 equivalent feet. The page's product selector spans the FB(N,L)0751-FB(N,L)6001 range from 750,000 to 6.0 million BTU/hr, and weight with water is 1,838 lb per the ratings table.
Best suited to
- Commercial plants whose design-day load approaches 1,000 MBH at the Crest's 96% efficiency
- Projects wanting the FB line's smallest footprint that keeps 3" piping
- Systems whose 50 MBH minimum fire tracks part loads with 20:1 turndown
Applicability and support
- Model number
- FBN1001
- 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 | 50 MBH | Per the I&O ratings table. |
| Heating input, maximum | 999 MBH | Per the I&O ratings table. |
| Output | ||
| Gross output | 961 MBH | Per the I&O ratings table. |
| Net AHRI water rating | 834 MBH | Per the I&O ratings table. |
| Efficiency | ||
| Efficiency (thermal) | 96 % | 96% thermal efficiency per the FBN1001 product-page spec block; the page headline prints 96.2%. |
| Venting and air | ||
| Air size | 6" | Per the I&O ratings table. |
| Vent size | 6" | 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 | 77 gal | Per the I&O ratings table. |
| Pipe outlet connection | 3" | Per the I&O ratings table. |
| Pipe inlet connection | 3" | Per the I&O ratings table. |
| Gas connection | 1-1/4" | Per the I&O ratings table. |
| Weight with water | 1,838 lb | Per the I&O ratings table. |
| Height | 78 in | Per the Lochinvar product page. |
| Width | 30 in | Per the Lochinvar product page. |
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 is the FBN1001's efficiency rating?
The FBN1001 product page headlines 96.2% thermal efficiency and its spec block prints 96%; the boiler is ENERGY STAR certified with an ASME H stamp per the page.
How does the FBN1001 connect?
3" pipe outlet and inlet, a 1-1/4" gas inlet, and 6" air and vent sizes per the I&O ratings table, with a 77-gallon water content.
Questions about the Lochinvar Crest FBN1001?
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 FBN0751 vs FBN1001Comparison
- Lochinvar Crest FBN1001 vs FBN1251Comparison
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- Lochinvar Crest FBN1501Same series
- Lochinvar Crest FBN1751Same series
- Lochinvar Crest FBN2001Same series
- Lochinvar Crest FBN2501Same series
- Lochinvar Crest FBN3001Same series
- Lochinvar Crest FBN3501Same series
- Lochinvar Crest FBN4001Same series
- Lochinvar Crest FBN5001Same series
- Lochinvar Crest FBN6001Same series
- Lochinvar Crest FCB1000Same series
- Lochinvar Crest FCB1500Same series
- Lochinvar Crest FCB2000Same series
- Lochinvar Crest FCB2500Same series
- Lochinvar Crest FCB3000Same series
- Lochinvar Crest FCB4000Same series
- Lochinvar Crest FCB5000Same series
- Lochinvar Crest FCB6000Same series
- 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.