Lochinvar · Noble Fire Tube (NKB/NKC/NCF)
Lochinvar Noble NCF199
The Noble NCF199 is the largest Noble floor combi: 19.9 to 199 MBH input at 95.0% AFUE with 185 MBH DOE capacity, on-demand DHW and 2" venting to 50 equivalent feet.
Key figures
- Max input
- 199 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 19.9 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Noble NCF199 in practice
The NCF199 closes the Noble combi range as the largest floor-standing member: 19.9 to 199 MBH of space-heating input with 185 MBH of DOE heating capacity and a 161 MBH AHRI net rating at 95.0% AFUE. It is the appliance for a large home or small building that wants the 199 MBH ceiling, the combi's on-demand hot water and a floor-mounted installation in one unit.
Water content is 2.7 gallons on the combi's 1" NPT space-heating and 3/4" DHW connections, with a 1/2" gas connection. The 2" vent option tightens to 50 equivalent feet at the 199 size while 3" remains at 100, so long runs use 3" pipe. Like the rest of the Noble family it runs the text-fault SMART CONTROL and appears as "Epic" on Lochinvar's residential page for Canada.
Best suited to
- Large homes and small buildings with loads approaching 199 MBH
- Floor-standing combi plants combining heat and hot water in one cabinet
- Projects able to commit to 3" venting to 100 equivalent feet
Applicability and support
- Model number
- NCF199L
- 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 | 19.9 MBH | Per the I&O ratings table. |
| Heating input, maximum | 199 MBH | Per the I&O ratings table. |
| Output | ||
| DOE heating capacity | 185 MBH | DOE heating capacity per the I&O ratings table. |
| AHRI net water rating | 161 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" | 50 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 | 2.7 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 are the NCF199's ratings?
19.9 to 199 MBH of input with 185 MBH DOE heating capacity and a 161 MBH AHRI net rating at 95.0% AFUE, per the Noble I&O ratings table.
Does the NCF199 require a hot-water tank?
No. As a combi it produces domestic hot water on demand through its 3/4" DHW connections, which is the reason the Noble combis exist alongside the heating-only NKB.
Questions about the Lochinvar Noble NCF199?
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 NCF150 vs NCF199Comparison
- Lochinvar Noble NKB080Same series
- Lochinvar Noble NKB110Same 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
- Noble Fire Tube (NKB/NKC/NCF) series hub
- Buying guide
Sources and verification
- Lochinvar — Noble Combi Gas Boiler Floor Mount (NCF110L) 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.