NTI Trinity TRX150
The NTI Trinity TRX150 is the 95% AFUE heating-only TRX for larger homes: 15 to 150 MBH input, stepping up to 1 1/4" NPT CH connections and 115 lb, with 2" venting to 100 ft or 3" to 150 ft per side.
Key figures
- Max input
- 150 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 15 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
NTI Trinity TRX150 in practice
The TRX150 marks the point where the TRX family steps up physically: the boiler gains 26 lb over the 88.6 lb TRX120, its CH connections move from 1" sweat to 1 1/4" NPT, and the input ceiling rises to 150 MBH. It stays heating-only at 95% AFUE with domestic hot water from an indirect tank or separate water heater.
For mid-to-larger Lower Mainland homes the TRX150 covers design-day loads that exceed the 120's ceiling while keeping a 15 MBH minimum fire that still modulates through mild weather. The 2" vent route remains available to 100 ft per side, so retrofit vent planning rarely forces a move up to the 199.
Best suited to
- Larger detached homes whose heat loss plus hot-water recovery exceeds 120 MBH
- Houses with radiators or in-floor loops needing up to about 139 MBH of output
- Installers comfortable with 1 1/4" NPT near-boiler piping
Applicability and support
- Model number
- TRX150
- 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 | ||
| Input, minimum | 15 MBH | Per the NTI product page. |
| Input, maximum | 150 MBH | Per the NTI product page. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | DOE AFUE per the NTI product page. |
| Domestic hot water | ||
| Domestic hot water | Heating-only; pair with an indirect tank or separate water heater | |
| 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 | 115 lb | Per the NTI product page. |
| CH water connections | 1 1/4" NPT | 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
- 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 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 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 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 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
What changes between the TRX120 and the TRX150?
Input rises from 120 to 150 MBH, weight from 88.6 to 115 lb, and the CH connections from 1" male sweat to 1 1/4" NPT. Both are heating-only and rated 95% AFUE.
Does the TRX150 make hot water?
No. It is heating-only. The TRX150C combi in the same series heats at 13.2 to 120 MBH and adds a domestic hot water plate.
What are the TRX150's venting limits?
2" runs to 100 ft or 3" runs to 150 ft per side per the NTI product page; the 150's 2" terms are not subject to the 199-model bulletin restriction.
Questions about the NTI Trinity TRX150?
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.
Compare and explore
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.