Lochinvar · Noble Fire Tube (NKB/NKC/NCF)
Lochinvar Noble NKB110
The Noble NKB110 is the 110 MBH Noble heating boiler: 11 to 110 MBH input at 95.0% AFUE with 102 MBH DOE capacity, sharing the Noble ratings table with the NKC110 and NCF110 combis.
Key figures
- Max input
- 110 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 11 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Noble NKB110 in practice
The NKB110 shares its ratings row with the NKC110 and NCF110 combis in the Noble I&O table — 11 to 110 MBH of input with 102 MBH of DOE heating capacity and an 89 MBH AHRI net rating at 95.0% AFUE — but it is the heating-only member of that row: no DHW connections, 1" sweat water fittings and a 1.4-gallon water content.
Sold under the Epic name in Canada on Lochinvar's residential page, the boiler connects gas at 1/2" and vents in 2" or 3" pipe to 100 equivalent feet at the 80-110 sizes. Because it produces no domestic hot water itself, it pairs with an indirect tank, and its SMART CONTROL display reports text-name faults rather than numeric codes.
Best suited to
- Homes whose heat-loss calculation fits between 80 and 110 MBH
- Owners who want Noble ratings without the combi's DHW complexity
- Pairing with a mid-size indirect tank for domestic hot water
Applicability and support
- Model number
- NKB110L
- 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 | 11 MBH | Per the I&O ratings table. |
| Heating input, maximum | 110 MBH | Per the I&O ratings table. |
| Output | ||
| DOE heating capacity | 102 MBH | DOE heating capacity per the I&O ratings table. |
| AHRI net water rating | 89 MBH | Net AHRI rating based on a piping and pickup allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE per the I&O ratings table. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler | The NKB is heating-only; Lochinvar's residential page pairs the Noble wall-mount boiler with the Squire indirect water heater. |
| Venting and air | ||
| Venting | Category IV sealed combustion; PVC, CPVC, polypropylene or stainless steel | In Canada, plastic venting must be a ULC S636-certified system. |
| Max. equivalent vent/air length, 2" | 100 ft | Table 3D (air intake/vent piping sizes), I&O manual. |
| Max. equivalent vent/air length, 3" | 100 ft | Table 3D (air intake/vent piping sizes), I&O manual. |
| Physical and connections | ||
| Water content | 1.4 gal | Per the I&O ratings table. |
| Space-heating water connections | 1" (sweat) | Noble ratings: NPT connections are used on combi units, sweat connections on the boiler. |
| Gas connection | 1/2" | Per the I&O ratings table. |
Manuals
Alerts documented for this model
- Memory Error
- Fan Speed
- LWCO
- Flame Sequence
- Outlet ARHL
- Air Pressure Switch
- AUX Limit Fault
- Flame Fail: Running
- Flame Fail: Ignition
- Flue Temp Limit
- Flue Temp High
- Outlet MRHL
- Outlet Temp High
- Outlet Temp DIFF
- Flue Sensor Fault
- Outlet Sensor Fault
- Inlet Sensor Fault
- Set Point Met
- Anti-Cycling
- Delta T High
- Low Voltage
- No Flue Temp Change
- Combi Sensor Fault (Combi Only)
- Lockout Inlet Sensor Fault
- Outdoor Sensor Missing
- No Hot Water at Faucets (Combi Only)
- DHW Water is not Hot Enough (Combi Only)
- Combi Boiler is Running but Does Not Supply Heated Water to Space Heating System (Combi Only)
- Space Heating System Heat Emitters Get Hot During a DHW Draw and the Combi Boiler does not Provide Hot Enough Domestic Hot Water (Combi Only)
- Lockout! Water Press Switch
Frequently asked questions
How does the NKB110 compare with the NKC110?
They share the ratings row — 11 to 110 MBH input, 102 MBH DOE capacity, 95.0% AFUE — but the NKC110 is a combi with 3/4" DHW connections while the NKB110 is heating-only with 1" sweat connections.
Is the Noble sold under another name in Canada?
Lochinvar's residential boilers page marks the Noble wall-mount boiler and combis as "Sold as Epic® in Canada," while the manuals and product pages themselves use the Noble name.
Questions about the Lochinvar Noble NKB110?
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 Noble NKB080 vs NKB110Comparison
- Lochinvar Noble NKB110 vs NKB150Comparison
- Lochinvar Noble NKB080Same series
- Lochinvar Noble NKB150Same series
- Lochinvar Noble NKB199Same series
- Lochinvar Noble NKC110Same series
- Lochinvar Noble NKC150Same series
- Lochinvar Noble NKC199Same series
- Lochinvar Noble NCF110Same series
- Lochinvar Noble NCF150Same series
- Lochinvar Noble NCF199Same series
- Noble Fire Tube (NKB/NKC/NCF) series hub
- Buying guide
Sources and verification
- Lochinvar — Noble Fire Tube Boiler (NKB080L) model page · accessed September 7, 2026
- Noble Fire Tube Boiler and Combi I&O/Service Manual, Rev AN · Rev AN · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.