Lochinvar · Noble Fire Tube (NKB/NKC/NCF)
Lochinvar Noble NKC150
The Noble NKC150 is the 150 MBH Noble wall-hung combi: 15 to 150 MBH space-heating input at 95.0% AFUE with 139 MBH DOE capacity and a 2-gallon water content.
Key figures
- Max input
- 150 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 15 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Noble NKC150 in practice
The NKC150 is the wall-hung combi of the Noble 150 ratings row: 15 to 150 MBH of space-heating input with 139 MBH of DOE heating capacity and a 121 MBH AHRI net rating at 95.0% AFUE. Where the NKB150 serves heating-only systems, the NKC150 adds the combi's DHW circuit and its 3/4" DHW connections.
It connects space heating on 1" NPT fittings with a 1/2" gas connection and holds 2.0 gallons of water. Venting allows 2" pipe to 60 equivalent feet or 3" to 100 at the 150 size, and the product family pages describe the SMART CONTROL's diverter technology as preventing the cold-water "sandwich" during DHW draws. Lochinvar's residential page sells this Noble combi as Epic in Canada.
Best suited to
- Homes whose heat-loss calculation sits between 110 and 150 MBH
- Households wanting a wall-hung combi's on-demand hot water at higher capacity
- Projects with 3" vent routes or short 2" runs to 60 equivalent feet
Applicability and support
- Model number
- NKC150L
- 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 | 15 MBH | Per the I&O ratings table. |
| Heating input, maximum | 150 MBH | Per the I&O ratings table. |
| Output | ||
| DOE heating capacity | 139 MBH | DOE heating capacity per the I&O ratings table. |
| AHRI net water rating | 121 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 | On demand from the combi's DHW circuit | Combi models produce DHW directly; the I&O ratings list 3/4" DHW water connections for combi units. |
| 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" | 60 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 | 2 gal | Per the I&O ratings table. |
| Space-heating water connections | 1" NPT | Noble ratings: NPT connections are used on combi units, sweat connections on the boiler. |
| DHW water connections | 3/4" | Combi-only, per the I&O ratings table (NPT = combi). |
| 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
What size space can the NKC150 heat?
It fires 15 to 150 MBH of input for space heating with 139 MBH of DOE heating capacity, so the room-by-room heat-loss calculation decides the home it fits — not floor area.
What connections does the NKC150 use?
1" NPT space-heating connections, 3/4" DHW connections and a 1/2" gas connection, with a 2.0-gallon water content, per the I&O ratings table.
Questions about the Lochinvar Noble NKC150?
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 NKC110 vs NKC150Comparison
- Lochinvar Noble NKC150 vs NKC199Comparison
- Lochinvar Noble NKB080Same series
- Lochinvar Noble NKB110Same series
- Lochinvar Noble NKB150Same series
- Lochinvar Noble NKB199Same series
- Lochinvar Noble NKC110Same 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 Combi Gas Boiler Wall Mount (NKC110L) 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.