NTI Trinity Lx800
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.
Key figures
- Max input
- 800 MBH
- Max CSA output
- —
- AFUE
- 94 %
- Min input
- 160 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
NTI Trinity Lx800 in practice
The Lx800 tops NTI's Lx line at 800 MBH input, stepping the venting up to 6" pipe with a 100 ft maximum run per side. It weighs 475 lb, connects on 2" NPT female water with a 1" NPT male gas connection, and carries the line's easy-to-clean stainless heat exchanger, intuitive touchscreen and advanced cascade settings.
With a 160 MBH minimum fire the 800 is squarely a plant boiler for heavy light-commercial and commercial hydronic loads. NTI's page prints 94% AFUE and its manual rates the 500-and-up sizes by combustion (95%) and thermal (94%) efficiency, which Boilers.ca reports as published rather than restating one figure.
Best suited to
- Commercial hydronic plants with loads between 160 and 800 MBH
- Buildings whose load outgrows the Lx600 and Lx700 classes
- Projects that can run 6" venting within 100 ft per side
Applicability and support
- Model number
- Lx800
- 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 | 160 MBH | Per the NTI product page. |
| Input, maximum | 800 MBH | Per the NTI product page. |
| Efficiency | ||
| Efficiency (AFUE) | 94 % | Product-page figure; the I&O manual rates sizes from 500 MBH by combustion (95%) and thermal (94%) efficiency rather than AFUE. |
| Domestic hot water | ||
| Domestic hot water | Heating-only; pair with an indirect tank or separate water heater | |
| Venting and air | ||
| Max. equivalent vent length | 100 ft | 6" pipe per side; maximum equivalent run per the NTI product page. |
| Physical and connections | ||
| Weight | 475 lb | Per the NTI product page. |
| Water connections | 2" NPT female | Per the NTI product page. |
| Gas connection | 1" NPT male | Per the NTI product page. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | NTI publishes LP conversion instructions for this series. |
Manuals
- Trinity Lx 150–800 I&O Manual, 99986573, V.2024-06-2899986573 · 2024-06-28
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Frequently asked questions
What venting does the Lx800 need?
6" pipe to a 100 ft maximum equivalent run per side, per the NTI product page — the largest venting class in the Lx line.
How does the Lx800 compare with the Lx600?
Input rises from 600 to 800 MBH, weight from 380 to 475 lb, and venting from 4" to 6" pipe; water connections (2" NPT female) and the 1" NPT male gas connection are unchanged.
Is the Lx800 available in Canada?
NTI is a Canadian manufacturer serving Canada and the United States from its single site, and the Lx page and manuals document Canadian provisions; availability through a BC distributor is confirmed at consultation.
Questions about the NTI Trinity Lx800?
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 — Trinity Lx Series product page · accessed September 7, 2026
- Trinity Lx 150–800 I&O Manual, 99986573, V.2024-06-28 · 99986573 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.