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NTI Boilers · Series

NTI Boilers Trinity Lx

The Trinity Lx is NTI's fire-tube condensing line for light-to-heavy commercial applications, also listed in its smaller sizes for residential use: Lx150 through Lx800 (plus the Lx700, which appears in the I&O manual but not the product page table), from 25 to 800 MBH input with easy-to-clean stainless steel heat exchangers.

Current seriesSold in CanadaNatural gasPropaneresidentialcommercial
Request service for this seriesReplacement estimate

Series facts

Type
condensing
Efficiency
93.5% AFUE
Fuel
Natural gas or propane; NTI publishes LP conversion instructions for the Lx series.
Venting
PVC, CPVC or polypropylene venting (NTI product page): 3" on the Lx150 and Lx200, 4" on the Lx300–Lx600 and 6" on the Lx800, with per-size maximum runs.
Models documented
8
Warranty
Not verified

The product page table lists AFUE from 93.5% to 94% across the sizes (93.5 / 93.5 / 93.7 / 94 / 94 / 94 / 94); larger sizes are rated on combustion and thermal efficiency in the manual.

About the Trinity Lx

NTI describes the Lx as its option for light to heavy commercial applications, with an easy-to-clean, high-power stainless steel heat exchanger, accessible electronics and an intuitive touchscreen with advanced cascade management. The product page table lists the Lx150, Lx200, Lx300, Lx400, Lx500, Lx600 and Lx800 (it omits the Lx700, which the 150–800 I&O manual covers at 160–700 MBH input).

The page lists AFUE of 93.5% (Lx150 and Lx200), 93.7% (Lx300) and 94% (Lx400 through Lx800), while the I&O manual gives DOE AFUE only for sizes up to 400 and rates the larger sizes by combustion efficiency (95%) and thermal efficiency (94%). Inputs span 25–150 MBH on the Lx150 up to 160–800 MBH on the Lx800, with the Lx150's LP maximum capped at 145 MBH.

Installation is floor-standing, with a wall-hung kit included for the Lx200–Lx400 (the page introduction says sizes up to 399 MBH can also be wall-hung). Venting is PVC, CPVC or polypropylene: 3" on the Lx150 and Lx200, 4" on the Lx300–Lx600 and 6" on the Lx800. In Greater Vancouver the Lx is sized by heat-loss or plant-demand calculation for multi-suite and light-commercial hydronic systems rather than by floor area.

Highlights

  • Fire-tube condensing line from the Lx150 to the Lx800 (25 to 800 MBH input)
  • Light-to-heavy commercial focus; also listed for residential use in smaller sizes
  • AFUE 93.5% (150 / 200), 93.7% (300) and 94% (400–800) per the product page
  • I&O manual rates the larger sizes by combustion (95%) and thermal (94%) efficiency
  • PVC, CPVC or polypropylene venting; 3" to 6" pipe depending on size
  • Lx700 (160–700 MBH) appears in the I&O manual but not the page table

Models

Trinity Lx models

One canonical page per model with input, output and efficiency kept separate.

CurrentSold in Canada
Input
25–150 MBH
Output (max)
—
AFUE
93.5 %

The NTI Trinity Lx150 is the entry size of the Lx fire-tube line: 25 to 150 MBH input on natural gas (145 MBH maximum on LP) at 93.5% AFUE, in a 100 lb floor-standing unit that can also use the wall-hung kits NTI includes for the Lx200–400.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
25–199 MBH
Output (max)
—
AFUE
93.5 %

The NTI Trinity Lx200 stretches the Lx entry class to 199 MBH: 25 to 199 MBH input at 93.5% AFUE in a 125 lb floor-standing boiler with a wall-hung kit included, on 3" venting to 105 ft.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
55–275 MBH
Output (max)
—
AFUE
93.7 %

The NTI Trinity Lx300 is the 93.7% AFUE step of the Lx line: 55 to 275 MBH input in a 180 lb floor-standing boiler, stepping up to 4" venting at 100 ft with 1 1/4" NPT water connections.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
75–399 MBH
Output (max)
—
AFUE
94 %

The NTI Trinity Lx400 is the last Lx size NTI's page lists for residential-capable use: 75 to 399 MBH input at 94% AFUE in a 225 lb floor-standing boiler (wall-hung kit included) with 4" venting to 100 ft.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
100–500 MBH
Output (max)
—
AFUE
94 %

The NTI Trinity Lx500 is the entry of the pure-commercial Lx class: 100 to 500 MBH input at a published 94% AFUE, in a 320 lb floor-standing boiler with 2" water connections and 4" venting to 100 ft.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
120–600 MBH
Output (max)
—
AFUE
94 %

The NTI Trinity Lx600 fires 120 to 600 MBH at a published 94% AFUE, weighing 380 lb with 2" water connections and 4" venting to 100 ft — the largest Lx size that still vents in 4" pipe.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
160–700 MBH
Output (max)
—
AFUE
—

The NTI Trinity Lx700 fires 160 to 700 MBH and appears in the Lx 150–800 I&O manual even though the product page's spec table omits it. NTI still publishes its submittal and specification downloads, making it the documented bridge between the 600 and the 800.

Natural gasPropaneHeating-only
Specifications, manuals and service
CurrentSold in Canada
Input
160–800 MBH
Output (max)
—
AFUE
94 %

The NTI Trinity Lx800 is the largest Lx fire-tube boiler: 160 to 800 MBH input at a published 94% AFUE, weighing 475 lb with 2" water connections and 6" venting to 100 ft per side.

Natural gasPropaneHeating-only
Specifications, manuals and service

Compare models in this series

Comparison of NTI Trinity Lx150 and NTI Trinity Lx200 and NTI Trinity Lx300 and NTI Trinity Lx400 and NTI Trinity Lx500 and NTI Trinity Lx600 and NTI Trinity Lx700 and NTI Trinity Lx800
SpecificationNTI Trinity Lx150NTI Trinity Lx200NTI Trinity Lx300NTI Trinity Lx400NTI Trinity Lx500NTI Trinity Lx600NTI Trinity Lx700NTI Trinity Lx800
Input, minimum25 MBH25 MBH55 MBH75 MBH100 MBH120 MBH160 MBH160 MBH
Input, maximum150 MBH199 MBH275 MBH399 MBH500 MBH600 MBH700 MBH800 MBH
output-max————————
Efficiency (AFUE)93.5 %93.5 %93.7 %94 %94 %94 %—94 %
turndown————————
Max. equivalent vent length105 ft (NG), 50 ft (LP)105 ft100 ft100 ft100 ft100 ft—100 ft
vent-max-2————————
Weight100 lb125 lb180 lb225 lb320 lb380 lb—475 lb

Read the full comparison: NTI Trinity Lx150 vs Lx200 →

Read the full comparison: NTI Trinity Lx200 vs Lx300 →

Read the full comparison: NTI Trinity Lx300 vs Lx400 →

Read the full comparison: NTI Trinity Lx400 vs Lx500 →

Read the full comparison: NTI Trinity Lx500 vs Lx600 →

Read the full comparison: NTI Trinity Lx600 vs Lx700 →

Read the full comparison: NTI Trinity Lx700 vs Lx800 →

Error codes and alerts

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Manuals

Official documents

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.

See all service areas

Services for NTI Boilers boilers

Related parts & service

Frequently asked questions

Is the Trinity Lx a residential boiler?

NTI markets the Lx for light to heavy commercial applications and also lists the smaller sizes for residential use. The Lx150–Lx400 sizes are the ones most often considered for larger homes; sizes from 500 MBH are light-commercial oriented.

Which models does the Lx series include?

The product page lists the Lx150, Lx200, Lx300, Lx400, Lx500, Lx600 and Lx800. The Lx700 (160–700 MBH) appears in the 150–800 I&O manual and in the submittal downloads even though the page's spec table omits it.

Why does the Lx page list AFUE when the manual rates larger sizes differently?

The product page table prints 93.5% to 94% AFUE across the range. The I&O manual gives DOE AFUE for sizes up to 400 and rates the larger sizes by combustion efficiency (95%) and thermal efficiency (94%), which Boilers.ca notes rather than restating one figure for all sizes.

Talk to a boiler technician

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.

Call 778-909-5731Request service

Related

Sources and verification

Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.

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