Triangle Tube INS155C
Triangle Tube INS155C
Triangle Tube INS155C
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Triangle Tube INS155C
Triangle Tube INS155C

Triangle Tube Instinct - 142K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent



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Triangle Tube Instinct - 142K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Triangle Tube Instinct - 142K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: INS155C
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Recommended Accessories

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Expert Recommended Accessories Selected by Bob, our Expert
Required Accessories 9
These accessories are required to properly setup/install this product.
Optional Accessories 10


    Triangle Tube is best known for feats of hydronic innovation and incredibly efficient products. The Triangle Tube Instinct is a high-efficiency condensing boiler featuring a fire tube heat exchanger and a market-leading warranty program. The Instinct includes Triangle Tube's CTRLMax Control System for a 60-second setup and simple, plain text operation. An included universal 3-in-1 vent adapter directly accepts PVC, Polypropylene and stainless steel. Available in both solo and combi models, the Instinct boiler is the perfect solution for highly efficient instant or indirect water heating.
  • High Efficiency Heating and Hot Water
  • The Triangle Tube Instinct combi boiler combines space heating and domestic hot water production while maintaining an impressive efficiency rating of 95% AFUE.
  • Fire Tube Heat Exchanger
  • The Instinct boiler features Triangle Tube's stainless steel fire tube heat exchanger, providing highly efficient heating with an impressive 8:1 turndown ratio.
  • Industry-Leading Performance
  • While fully condensing, the Instinct boiler provides over 5 GPM of hot water.
  • CTRLMax Control System
  • The included CTRLMax control system allows boiler setup in 60 seconds. Flexible but easy to use, the CTRLMax system monitors and controls the boiler to operate as efficiently as possible.
  • Extended Warranty
  • Triangle Tube offers two levels of extended warranties for Instinct boilers - up to 6 years for parts and 3 years for labor. Please see the warranty statement under the "Manuals" tab for more information.


specs product image PID-102840
General Information
Product Line
Medium Learn More
Hot Water
Fuel Type Learn More
Natural Gas
Combustion Type Learn More
Vent Type Learn More
Direct Vent
DHW Production Learn More
Modulating/Staging Learn More
Mount Type
Minimum Altitude
0 Feet
Maximum Altitude
20000 Feet
Includes Pump
Assembly Type
Gas Conversion Kit
AFUE Learn More
95 %
Maximum Input Capacity Learn More
155000 BTU
Minimum Input Capacity
19375 BTU
DOE Heating Capacity Learn More
142000 BTU
Net I=B=R Capacity Learn More
123000 BTU
Ultra Low NOx Emissions Learn More
Low NOx Emissions Learn More
Turndown Ratio
Electrical Data
120 Volts
60 Hz
Flue Connection Size
3 Inches
Gas Connection Size
3/4 Inch
Cold Water Inlet
3/4 Inch
Hot Water Outlet
3/4 Inch
Boiler Supply
1 Inch
Boiler Return
1 Inch
Product Height
33 Inches
Product Width
21 3/4 Inches
Product Depth
16 1/2 Inches
Product Weight
110 Pounds
CSA Listed
Energy Star Listed
ASME Certified
Warranty Information
Parts Warranty Learn More
2 Years
Heat Exchanger Warranty
10 Years


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How-To Articles

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Triangle Tube Instinct - 142K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Triangle Tube INS155C
Triangle Tube INS155C
Triangle Tube INS155C
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