NTI Trinity TRX110C
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.
Key figures
- Max input
- 106 MBH
- Max CSA output
- —
- AFUE
- 95.5 %
- Min input
- 11.2 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
NTI Trinity TRX110C in practice
The TRX110C covers space heating and domestic hot water in one wall-hung unit, with NTI rating the DHW side at 2.7 GPM continuous for a 77°F rise. Its heating input is capped at 106 MBH — the DHW side draws more on the same burner — and its 95.5% AFUE rating makes it the most efficient TRX after the 96% TRX085.
For a compact BC home the appeal is a single 91 lb appliance replacing boiler and tank, with a DHW figure that suits steady single-shower use rather than simultaneous multi-bathroom draws. When the household's peaks exceed 2.7 GPM at a 77°F rise — or the incoming water is cold in winter — the TRX150C (3.5 GPM) or a heating-only boiler with an indirect tank is the next conversation.
Best suited to
- Townhouses and compact homes with one primary bathroom
- Households wanting boiler plus DHW from one light wall-hung appliance
- Low heat-loss homes whose heating load fits within 106 MBH
Applicability and support
- Model number
- TRX110C
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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 NTI Boilers. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Space-heating input, minimum | 11.2 MBH | Per the NTI product page. |
| Space-heating input, maximum | 106 MBH | Per the NTI product page. |
| Efficiency | ||
| Efficiency (AFUE) | 95.5 % | DOE AFUE per the NTI product page; the TRX110C is the only non-085 TRX rated above 95%. |
| Domestic hot water | ||
| DHW capacity at 77°F rise | 2.7 GPM | Continuous delivery per the NTI product page. |
| Domestic hot water | Integrated combi (DHW plate) in the appliance | |
| Venting and air | ||
| Max. equivalent vent length, 2" | 100 ft | Each side per the I&O manual. |
| Max. equivalent vent length, 3" | 150 ft | Each side per the I&O manual. |
| Physical and connections | ||
| Weight | 91 lb | Per the NTI product page. |
| CH water connections | 1" male sweat with adapter | Per the NTI product page. |
| DHW connections | 3/4" male sweat with adapter | Per the NTI product page. |
| Gas connection | 3/4" NPT | Male NPT per the NTI product page. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | NTI publishes LP conversion instructions for this series. |
| Turndown ratio | up to 11:1 | Manufacturer marketing figure on the NTI product page. |
Manuals
- TRX 085–150C I&O Manual, 86341 / 420010970805 Rev 01.24.23420010970805 Rev 01 · 2023-01-24
- TRX 150–199C I&O Manual, 420011303700 (Rev 2024.02.16)420011303700 · 2024-02-16
- TRX Series II 085–150C I&O Manual, 420012001500 Rev 04 (03182024)420012001500 Rev 04 · 2024-03-18
- TRX Series II 150–199C I&O Manual, 420012001300 Rev 05 (061824)420012001300 Rev 05 · 2024-06-18
Alerts documented for this model
- 1 01
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- 115
- 1 16
- 150
- 1 P1
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- 201
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- NOAVL
- EMERG
- CONFL
- 1 01
- 1 03
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- 1 14
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- 1 16
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- 2 09
- 2 P2
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- 3 P9
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- 440
- 4 41
- 5 01
- 5 02
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- 5 P1
- 5 P2
- 5 P6
- 5 P3
- 6 02
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- 6 19
- NOAVL
- EMERG
- CONFL
- 1 01
- 1 03
- 1 04
- 1 05
- 1 06
- 1 07
- 1 08
- 1 10
- 1 12
- 1 14
- 115
- 1 16
- 150
- 1 P1
- 1 P2
- 1 P3
- 201
- 2 03
- 2 05
- 2 09
- 2 P2
- 3 01
- 3 02
- 3 03
- 3 04
- 3 05
- 3 06
- 3 07
- 3 09
- 3 11
- 3 P9
- 4 11
- 4 12
- 4 13
- 4 30
- 4 31
- 440
- 4 41
- 5 01
- 5 02
- 5 04
- 5 P1
- 5 P2
- 5 P6
- 5 P3
- 6 02
- 6 03
- 6 05
- 6 12
- 6 19
- NOAVL
- EMERG
- CONFL
- 1 01
- 1 02
- 1 03
- 1 04
- 1 05
- 1 06
- 1 07
- 1 08
- 1 10
- 1 12
- 1 14
- 115
- 1 16
- 150
- 1 P1
- 1 P2
- 1 P3
- 201
- 2 03
- 2 05
- 2 09
- 2 P2
- 3 01
- 3 02
- 3 03
- 3 04
- 3 05
- 3 06
- 3 07
- 3 09
- 3 11
- 3 P9
- 4 11
- 4 12
- 4 13
- 4 30
- 4 31
- 440
- 4 41
- 5 01
- 5 02
- 5 04
- 5 P1
- 5 P2
- 5 P6
- 5 P3
- 6 02
- 6 03
- 6 05
- 6 12
- 6 19
- NOAVL
- EMERG
- CONFL
Frequently asked questions
Is the TRX110C more efficient than the other combis?
Yes. NTI rates it 95.5% AFUE, against 95% for the TRX150C and TRX199C; only the heating-only TRX085 (96%) rates higher in the series.
How much hot water does the TRX110C deliver?
2.7 GPM continuous at a 77°F rise per the NTI product page. The TRX150C raises that to 3.5 GPM and the TRX199C to 4.8 GPM.
Why is the TRX110C's heating input 106 MBH?
NTI publishes the TRX110C with an 11.2 to 106 MBH space-heating input, separate from its DHW-side rating; heating and DHW loads are sized together, not from the heating row alone.
Questions about the NTI Trinity TRX110C?
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.
Sources and verification
- NTI — TRX Series product page · accessed September 7, 2026
- NTI — TRX Series II product page · accessed September 7, 2026
- TRX 085–150C I&O Manual, 86341 / 420010970805 Rev 01.24.23 · 420010970805 Rev 01 · accessed September 7, 2026
- TRX 150–199C I&O Manual, 420011303700 (Rev 2024.02.16) · 420011303700 · accessed September 7, 2026
- TRX Series II 085–150C I&O Manual, 420012001500 Rev 04 (03182024) · 420012001500 Rev 04 · accessed September 7, 2026
- TRX Series II 150–199C I&O Manual, 420012001300 Rev 05 (061824) · 420012001300 Rev 05 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.