NTI Series
Since 1967,NTIhas been a leader in high-efficiency gas boilers, water heaters, heat pumps & combi furnaces.
most popular
energy star
Trinity® Fire Tube · Heating
TFTN Series
98%
AFUE
KEY FEATURES
Up to 98% AFUE — top-tier efficiency
Stainless-steel fire-tube heat exchanger
11 sizes: 85,000–850,000 BTU/h
Built-in zone control (3 zones + DHW)
Touchscreen + onboard Wi-Fi · venting to 150 ft
WARRANTY
Limited heat-exchanger & parts warranty
Extended coverage with online registration
energy star
FTVN II · Combi or Heat-Only
FTVN Series II
96%
AFUE
KEY FEATURES
Combi & heat-only models
Up to 96% AFUE efficiency
Sizes to 199,000 BTU/h · 10:1 turndown
Combi DHW up to 4.8 GPM
NTI NET™ built-in Wi-Fi connectivity
WARRANTY
Limited heat-exchanger & parts warranty
Extended coverage with online registration
energy star
TRX II · Water Tube
TRX Series II
96%
AFUE
KEY FEATURES
XTRATECH® stainless water-tube exchanger
Combi & heat-only models
Up to 96% AFUE · 11:1 turndown
Combi DHW up to 4.8 GPM
NTI NET™ built-in Wi-Fi
WARRANTY
Limited heat-exchanger & parts warranty
Extended coverage with online registration
Warranty coverage requires online product registration within 90 days of installation. AFUE ratings reflect each series' top-performing models; specifications subject to change by the manufacturer.
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