Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Lx150 and Lx200 are the entry pair of the Trinity Lx fire-tube line: both 93.5% AFUE with the same 1" water and 1/2" gas connections and the same 3" venting class. The Lx200 fires 25 to 199 MBH instead of 25 to 150 MBH, weighs 125 lb instead of 100, and has no LP cap at the top end like the Lx150's 145 MBH maximum.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | NTI Trinity Lx150 | NTI Trinity Lx200 |
|---|---|---|
| Input, minimum | 25 MBH | 25 MBH |
| Input, maximum | 150 MBH | 199 MBH |
| Efficiency (AFUE) | 93.5 % | 93.5 % |
| Weight | 100 lb | 125 lb |
| Max. equivalent vent length | 105 ft (NG), 50 ft (LP) | 105 ft |
| Water connections | 1" NPT female | 1" NPT female |
| Gas connection | 1/2" NPT female | 1/2" NPT female |
| Domestic hot water | Heating-only; pair with an indirect tank or separate water heater | Heating-only; pair with an indirect tank or separate water heater |
Both models share the Lx platform's easy-to-clean stainless heat exchanger at 93.5% AFUE, with the same 1" NPT female water connections, 1/2" NPT female gas connections and 3" venting to 105 ft per side. The Lx150 fires 25 to 150 MBH at 100 lb; the Lx200 fires 25 to 199 MBH at 125 lb.
The Lx150 carries a propane caveat that the Lx200 does not: NTI caps its LP input at 145 MBH and limits its LP vent run to 50 ft, against the 105 ft natural-gas figure. On the Lx200 the page prints a straight 25 to 199 MBH input without that LP cap.
Both are heating-only and suited to larger homes and light-commercial loads. The Lx200 is the step when the heat-loss or plant-demand calculation approaches 199 MBH — it adds 49 MBH of ceiling for 25 lb within the same connections and venting plan.
NTI Boilers
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.
NTI Boilers
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.
Both are 93.5% AFUE on the same connections and 3" venting. The Lx200 fires to 199 MBH instead of 150 MBH and weighs 125 lb against 100 lb.
Yes — NTI caps the Lx150's LP input at 145 MBH and its LP vent run at 50 ft, against 150 MBH and 105 ft on natural gas.
When the calculated load or plant demand exceeds 150 MBH. Below that, the Lx150 covers the same ground at 25 lb less weight.
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.