Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The TRX110C and TRX150C are the two smaller TRX combis on the same light chassis class: 91 lb versus 92.8 lb with the same 1" sweat CH connections. The 150C lifts heating input from 106 to 120 MBH and continuous DHW from 2.7 to 3.5 GPM at a 77°F rise, at the cost of a 95% AFUE rating against the 110C's 95.5%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | NTI Trinity TRX110C | NTI Trinity TRX150C |
|---|---|---|
| Space-heating input, minimum | 11.2 MBH | 13.2 MBH |
| Space-heating input, maximum | 106 MBH | 120 MBH |
| Efficiency (AFUE) | 95.5 % | 95 % |
| Turndown ratio | up to 11:1 | up to 11:1 |
| Weight | 91 lb | 92.8 lb |
| Max. equivalent vent length, 2" | 100 ft | 100 ft |
| Max. equivalent vent length, 3" | 150 ft | 150 ft |
| CH water connections | 1" male sweat with adapter | 1" male sweat with adapter |
| DHW connections | 3/4" male sweat with adapter | 3/4" male sweat with adapter |
| DHW capacity at 77°F rise | 2.7 GPM | 3.5 GPM |
| Domestic hot water | Integrated combi (DHW plate) in the appliance | Integrated combi (DHW plate) in the appliance |
Both combis are wall-hung TRX units with integrated DHW, the same 1" male sweat CH connections with adapters, 3/4" DHW connections and identical 2" (100 ft) and 3" (150 ft) venting. The 110C heats at 11.2 to 106 MBH and the 150C at 13.2 to 120 MBH.
NTI rates continuous DHW at 2.7 GPM for the 110C and 3.5 GPM for the 150C at a 77°F rise — the 150C adds roughly 30% more hot-water headroom for 1.8 lb of extra weight. The efficiency trade is real: the 110C is rated 95.5% AFUE and the 150C 95%.
For a BC household the DHW figure drives the step: if back-to-back or simultaneous draws exceed 2.7 GPM continuous at a 77°F rise, the 150C covers them; if the home also stays under 106 MBH of calculated heating load, the 110C's higher efficiency and lower minimum fire (11.2 MBH) keep it attractive.
NTI Boilers
The NTI Trinity TRX110C is the smallest TRX combi: space heating at 11.2 to 106 MBH input, 95.5% AFUE, and 2.7 GPM continuous DHW at a 77°F rise, all at 91 lb with 2" venting to 100 ft or 3" to 150 ft.
NTI Boilers
The NTI Trinity TRX150C is the mid-size TRX combi: space heating at 13.2 to 120 MBH input and 3.5 GPM continuous DHW at a 77°F rise, rated 95% AFUE in a 92.8 lb wall-hung boiler.
The TRX110C at 95.5% AFUE; the TRX150C is rated 95% per NTI's product table.
3.5 GPM continuous at a 77°F rise versus 2.7 GPM on the 110C — about 30% more on the DHW side.
Nearly — 91 lb for the TRX110C and 92.8 lb for the TRX150C, with the same 1" sweat CH connections and venting terms.
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.