Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The TFTN150 and TFTN199 are the two largest TFTN wall models in the compact cabinet class: both 95% AFUE, both 19 7/8 by 34 1/8 by 18 3/4 inches, with the same connections and venting. The 199 fires to 199 MBH instead of 150 but its minimum fire rises to 19.9 MBH and it weighs 140 lb against 122 lb with water.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | NTI Trinity TFTN150 | NTI Trinity TFTN199 |
|---|---|---|
| Input, minimum | 15 MBH | 19.9 MBH |
| Input, maximum | 150 MBH | 199 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Weight | 122 lb | 140 lb |
| Width | 19.875 in | 19.875 in |
| Height | 34.125 in | 34.125 in |
| Depth | 18.75 in | 18.75 in |
| Max. equivalent vent length, 2" | 100 ft | 100 ft |
| Max. equivalent vent length | 150 ft | 150 ft |
| CH water connections | 1 1/4" NPT | 1 1/4" NPT |
| 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 |
The 150 and 199 share the compact TFTN cabinet exactly — 19 7/8 inches wide, 34 1/8 inches high, 18 3/4 inches deep — with the same 1 1/4" NPT CH connections, 3/4" NPT gas and 2" (100 ft) / 3" (150 ft) venting terms. Both are rated 95% AFUE and heating-only.
The differences are range and weight: the 150 fires 15 to 150 MBH at 122 lb with water, and the 199 fires 19.9 to 199 MBH at 140 lb. The 199's 18 lb penalty buys 49 MBH of ceiling, but its minimum fire is 4.9 MBH higher, which shortens steady condensing in homes whose load sits well below 199 MBH.
Since the cabinet is identical, there is no installation difference to weigh — only the calculated load. A home or small multi-suite building whose heat-loss plus recovery demand approaches 199 MBH justifies the 199; loads that fit within 150 MBH keep the lighter 150 with its lower minimum fire.
NTI Boilers
The NTI Trinity TFTN150 is the 95% AFUE wall-hung TFTN for mid-to-larger homes: 15 to 150 MBH input, 122 lb with water, on 1 1/4" NPT CH connections with 2" venting to 100 ft or 3" to 150 ft.
NTI Boilers
The NTI Trinity TFTN199 is the 95% AFUE wall-hung TFTN at the classic 199 MBH mark: 19.9 to 199 MBH input, 140 lb with water, still on 1 1/4" NPT CH connections with 2" venting to 100 ft or 3" to 150 ft.
No. Both measure 19 7/8 by 34 1/8 by 18 3/4 inches; the 199 simply weighs more (140 lb against 122 lb with water) and fires higher.
Yes — 2" to 100 ft or 3" to 150 ft per side on both, with no 199-model restriction printed on the TFTN page.
When the heat-loss calculation plus hot-water recovery demand more than the 150 can deliver on a design day. Extra ceiling without a matching load raises the minimum fire the boiler idles at in mild weather.
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.