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Comparison
Verdict in brief
The IBC SFC 199-1 and Lochinvar Noble NKC199 are both 95% AFUE combis that draw up to 199 MBH for hot water, but they heat differently: the NKC199 applies its full 19.9 to 199 MBH input to space heating while IBC caps the SFC 199-1's heating side at 125 MBH. Lochinvar's combi heats larger buildings; the SFC 199-1 answers with a 5.0 GPM continuous DHW rating, 84 lb weight and longer 3" venting reach.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC SFC 199-1 Superflow | Lochinvar Noble NKC199 |
|---|---|---|
| Heating input, minimum | 28.5 MBH | 19.9 MBH |
| Heating input, maximum | 125 MBH | 199 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Flue material | 2" Schedule 40 PVC, CPVC or PPs | Category IV sealed combustion; PVC, CPVC, polypropylene or stainless steel |
| Max. equivalent vent length, 2" | 65 ft | 50 ft |
| Max. equivalent vent length, 3" | 120 ft | 100 ft |
| Heating water connections | 1" NPT | 1" NPT |
| DHW connections | 3/4" NPT | 3/4" |
| Gas connection | 3/4" NPT | 1/2" |
| Domestic hot water | Integrated coil in the main heat exchanger (combi); built-in bypass valve to steady DHW temperatures | On demand from the combi's DHW circuit |
Both are wall-hung condensing combis at 95% AFUE (Lochinvar prints 95.0%) with a 199 MBH DHW-class input, but the space-heating envelopes differ sharply. IBC publishes the SFC 199-1's heating input at 28.5 to 125 MBH with 199 MBH reserved for DHW, while Lochinvar lists the Noble NKC199 at 19.9 to 199 MBH heating input with a 185 MBH DOE heating capacity — meaning the Noble can cover heating loads the SFC simply cannot reach.
On the DHW side IBC's numbers lead: 5.0 GPM continuous delivery at a 67°F rise and a 7 GPM maximum DHW flow for the SFC 199-1, against the Noble's on-demand DHW through 3/4" connections with no GPM delivery figure in its ratings table. Buyers with high simultaneous draws get more certainty from the IBC's published GPM, while buyers with a large heating load need the Noble's input range regardless.
Installation details differ too: the SFC 199-1 weighs 84 lb (38 kg) with 1" heating connections, 3/4" DHW and gas connections, and vents 2" to 65 feet or 3" to 120 feet per side; the NKC199 keeps 1" NPT water on the combi with 3/4" DHW and 1/2" gas, and vents 2" to 50 feet or 3" to 100 feet. A heat-loss calculation first, then the DHW draw, decides which compromise fits.
IBC Technologies
The IBC SFC 199-1 is the largest Superflow combi: 95% AFUE, up to 125 MBH for space heating and 199 MBH for hot water, 5 GPM continuous DHW at a 67°F rise, with wireless cascade of up to eight units on the SFC 199-1.
Lochinvar
The Noble NKC199 is the top Noble wall-hung combi: 19.9 to 199 MBH space-heating input at 95.0% AFUE with 185 MBH DOE capacity, DHW on demand through 3/4" connections.
Yes: Lochinvar lists 199 MBH of heating input for the NKC199 versus a 125 MBH heating cap on the IBC SFC 199-1, whose extra input is reserved for hot water.
IBC publishes 5.0 GPM continuous at a 67°F rise for the SFC 199-1; Lochinvar's NKC199 table lists on-demand DHW through 3/4" connections without a GPM figure.
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 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.