Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Compass NC150C and NC199C are the two largest floor-standing Compass combis, both 95% AFUE. The NC199C fires to 199 MBH instead of 150 and delivers 4.8 GPM continuous DHW against 3.6 GPM at a 77°F rise, in an 215 lb cabinet against 204 lb — with the highest minimum fire in the line at 19.9 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | NTI Compass NC150C | NTI Compass NC199C |
|---|---|---|
| Space-heating input, minimum | 15 MBH | 19.9 MBH |
| Space-heating input, maximum | 150 MBH | 199 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown ratio | up to 10:1 | up to 10:1 |
| Weight | 204 lb | 215 lb |
| Max. equivalent vent length, 2" | 100 ft | 100 ft |
| Max. equivalent vent length, 3" | 150 ft | 150 ft |
| CH water connections | 1 1/4" NPT | 1 1/4" NPT |
| DHW connections | 3/4" NPT | 3/4" NPT |
| DHW capacity at 77°F rise | 3.6 GPM | 4.8 GPM |
| Domestic hot water | Integrated combi (DHW plate) in the appliance | Integrated combi (DHW plate) in the appliance |
Both combis run the Compass floor platform at 95% AFUE with integrated DHW, the same 1 1/4" NPT CH connections, 3/4" NPT DHW connections and identical 2" (100 ft) / 3" (150 ft) venting terms. The 150C fires 15 to 150 MBH in the 204 lb cabinet and the 199C fires 19.9 to 199 MBH in the 215 lb cabinet.
NTI rates continuous DHW at 3.6 GPM for the 150C and 4.8 GPM for the 199C at a 77°F rise — the 199C adds a third more hot-water headroom, which is the primary reason to step up. Its 19.9 MBH minimum fire is the highest in the heating-only and combi Compass lines.
For a large home replacing a floor boiler and tank, the 199C consolidates both into one 215 lb cabinet with the strongest DHW rating the Compass line offers. The heating side must still be justified by calculation: below roughly 150 MBH of load, the 150C's lower minimum fire keeps more steady condensing hours.
NTI Boilers
The NTI Compass NC150C is the mid-size floor-standing Compass combi: space heating from 15 to 150 MBH input plus 3.6 GPM continuous DHW at a 77°F rise, rated 95% AFUE in a 204 lb floor cabinet.
NTI Boilers
The NTI Compass NC199C is the flagship floor-standing Compass combi: space heating at 19.9 to 199 MBH input with 4.8 GPM continuous DHW at a 77°F rise, rated 95% AFUE in a 215 lb floor cabinet.
4.8 GPM continuous at a 77°F rise, against 3.6 GPM on the NC150C — the highest DHW rating in the Compass line.
No. The NC199C weighs 215 lb against the NC150C's 204 lb; connections and venting are identical.
When the heat-loss calculation is well below 199 MBH. Its 19.9 MBH minimum fire is the highest in the line, so a smaller calculated load will cycle more rather than condensing steadily.
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.