Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The FTG1200 and FTG1400 are the two smallest FTG sizes on NTI's product page and share the same physical class: 1,210 lb, 1 1/4" NPT female gas, 3" grooved water connections and 8 in venting. The 1400 fires 140 to 1400 MBH instead of 120 to 1200 MBH, lifting heating capacity from 1,153 to 1,344 MBH and the Net AHRI rating from 1,003 to 1,169 MBH at 96% thermal efficiency against the 1200's 96.1%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | NTI Trinity FTG1200 | NTI Trinity FTG1400 |
|---|---|---|
| Input, minimum | 120 MBH | 140 MBH |
| Input, maximum | 1,200 MBH | 1,400 MBH |
| Thermal efficiency | 96.1 % | 96 % |
| Heating capacity | 1,153 MBH | 1,344 MBH |
| Net AHRI rating | 1,003 MBH | 1,169 MBH |
| Weight | 1,210 lb | 1,210 lb |
| Weight, with water | 1,500 lb | 1,500 lb |
| Water connections (inlet / outlet) | 3" grooved joint | 3" grooved joint |
| Gas connection | 1 1/4" NPT female | 1 1/4" NPT female |
| Air inlet size | 8 in | 8 in |
| Flue size | 8 in | 8 in |
| Canada altitude derate | 10% derate at 2,000–4,500 ft | 10% derate at 2,000–4,500 ft |
| 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 boilers are indoor floor-standing commercial fire-tube units in the same class: 1,210 lb on the product page (1,500 lb with water per the I&O manual), a 1 1/4 in NPT female gas connection, 3 in grooved water connections on inlet and outlet, and 8 in air inlet and flue runs to 150 ft.
NTI lists the FTG1200 at 120 to 1200 MBH input with 96.1% thermal efficiency — the top rating on the FTG table — a 1,153 MBH heating capacity and a 1,003 MBH Net AHRI rating. The FTG1400 fires 140 to 1400 MBH at 96% with a 1,344 MBH heating capacity and a 1,169 MBH Net AHRI rating, so the step adds about 190 MBH of output for one tenth of an efficiency point and a minimum fire that rises from 120 to 140 MBH.
Both are heating-only plant boilers sized from a demand calculation, and the FTG I&O manual requires a 10% Canada altitude derate between 2,000 and 4,500 ft for the family. The 1400 earns its place when plant demand exceeds the 1200's ceiling; loads that fit under 1,200 MBH keep the slightly higher-rated 1200 with its lower minimum fire.
NTI Boilers
The NTI Trinity FTG1200 is the entry size of the FTG commercial fire-tube line as NTI's page lists it: 120 to 1200 MBH input at 96.1% thermal efficiency, with a 1,153 MBH heating capacity and a 1,003 MBH Net AHRI rating.
NTI Boilers
The NTI Trinity FTG1400 lifts the FTG page's entry class to a 1,400 MBH ceiling: 140 to 1400 MBH input at 96% thermal efficiency, with a 1,344 MBH heating capacity and a 1,169 MBH Net AHRI rating.
Input rises from 120–1200 to 140–1400 MBH, heating capacity from 1,153 to 1,344 MBH and the Net AHRI rating from 1,003 to 1,169 MBH; thermal efficiency eases from 96.1% to 96%. Weight, connections and venting are unchanged.
The FTG1200 at 96.1% thermal efficiency; the FTG1400 is rated 96% per NTI's product table.
Yes — 1,210 lb on the NTI product page for both, with the FTG I&O manual listing the class at 1,500 lb with water.
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 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.