Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The GF 200 and GF150 are the two Green Furnace combi-furnace sizes: the GF 200 spans 19,900-199,000 BTU/hr DHW input at 97% AFUE with up to 7.8 gpm at a 50°F rise, while the GF150 spans 13,200-150,000 BTU/hr at 95% AFUE with 3.6 gpm at a 77°F rise and up to 3 tons of cooling.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | NTI GF 200 | NTI GF150 |
|---|---|---|
| DHW input, maximum | 199 MBH | 150 MBH |
| Efficiency (AFUE) | 97 % | 95 % |
| Max DHW flow at 77°F rise | — | 3.6 GPM |
| DHW flow at 80°F rise | 4.8 GPM | — |
| Venting | Forced draft direct vent, 2" or 3" | 2" (0-100 ft intake / 6-100 ft exhaust) or 3" (0-150 ft intake / 6-150 ft exhaust) |
| Gas inlet | 3/4" NPT | 3/4" NPT-M |
The GF200 submittal lists space-heating input of 19,900-80,000 BTU/hr and DHW input of 19,900-199,000 BTU/hr with 97% AFUE and a 0.97 energy factor; the GF150 spec table lists 13,200-120,000 BTU/hr space heating and 13,200-150,000 BTU/hr DHW with 95% AFUE.
Domestic hot water delivery is printed on different bases: the GF 200's flow table gives 7.8 gpm at a 50°F rise, 6.0 gpm at 65°F and 4.8 gpm at 80°F, while the GF150 prints 3.6 gpm at a 77°F rise.
The GF150 adds cooling capability up to 3 tons with 360-1200 CFM cooling airflow, while both share forced-draft direct venting in 2" or 3" pipe and 3/4" gas connections.
NTI Boilers
The NTI GF 200 is a combi-furnace with 19,900-80,000 BTU/hr space-heating input, 19,900-199,000 BTU/hr DHW input, 97% AFUE and a 0.97 DHW energy factor, delivering up to 7.8 gpm at a 50°F rise from an internal recirculation and buffer tank.
NTI Boilers
The NTI GF150 is a combi-furnace with 13,200-120,000 BTU/hr space-heating capacity, 13,200-150,000 BTU/hr DHW capacity, 95% AFUE, up to 3 tons of cooling and 3.6 gpm of domestic hot water at a 77°F rise.
The GF 200 prints 97% AFUE and a 0.97 DHW energy factor; the GF150 prints 95% AFUE.
The GF150's spec table lists cooling capacity up to 3 tons with 360-1200 CFM cooling airflow; the GF200 submittal is printed around heating and DHW capacity.
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 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.