Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Noble NCF150 and NCF199 are the two largest floor-standing Noble combis: the 199 fires 19.9 to 199 MBH with 185 MBH of DOE capacity and 161 MBH AHRI net against the 150's 139 and 121, holds 2.7 gallons against 2.0, and its 2" vent allowance drops to 50 equivalent feet.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Lochinvar Noble NCF150 | Lochinvar Noble NCF199 |
|---|---|---|
| Heating input, minimum | 15 MBH | 19.9 MBH |
| Heating input, maximum | 150 MBH | 199 MBH |
| DOE heating capacity | 139 MBH | 185 MBH |
| AHRI net water rating | 121 MBH | 161 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Water content | 2 gal | 2.7 gal |
| Space-heating water connections | 1" NPT | 1" NPT |
| DHW water connections | 3/4" | 3/4" |
| Gas connection | 1/2" | 1/2" |
| Max. equivalent vent/air length, 2" | 60 ft | 50 ft |
| Max. equivalent vent/air length, 3" | 100 ft | 100 ft |
| Domestic hot water | On demand from the combi's DHW circuit | On demand from the combi's DHW circuit |
Both are floor-standing Noble combis with on-demand domestic hot water, 1" NPT space-heating and 3/4" DHW connections, a 1/2" gas connection and the SMART CONTROL — the floor versions of the NKC150 and NKC199 combis.
The NCF199 is the top of the Noble combi range: input reaches 199 MBH with 185 MBH of DOE heating capacity. Its 19.9 MBH minimum fire is the highest in the line, so a building whose load never approaches 199 MBH will cycle more on the larger unit.
Venting separates the two sizes: the 150 allows 2" pipe to 60 equivalent feet and the 199 only to 50, with 3" venting to 100 feet on both. Water content rises from 2.0 to 2.7 gallons at the 199 size.
Lochinvar
The Noble NCF150 is the 150 MBH floor-standing Noble combi: 15 to 150 MBH input at 95.0% AFUE with 139 MBH DOE capacity and on-demand DHW through 3/4" connections.
Lochinvar
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.
Maximum input rises from 150 to 199 MBH, DOE capacity from 139 to 185 MBH and water content from 2.0 to 2.7 gallons; minimum fire rises from 15 to 19.9 MBH.
2" pipe to 50 equivalent feet or 3" pipe to 100, per Table 3A of the Noble I&O manual — the tightest 2" allowance in the floor combi line.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.