Triangle Tube INS155C Instinct Combi Boiler

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Triangle tube's INS155C Instinct Combi boiler (High-efficiency condensing boiler) is an all stainless steel fire tube heat exchanger. It provides 5+ GPM hot water while fully condensing in DHW mode which is an industry-leading performance.

Features of Instinct 155C Combi Boiler

  • Full modulation with a turndown ratio up to 8:1
  • 3 in 1 Universal Vent Adapter
  • Efficiency Rating of 95%
  • Industry-Leading Performance with 5+ GPM Hot Water while Fully Condensing
  • CTRLMAX Control System with 60 Second Set-up
  • Natural Gas or Propane
  • Lightweight construction for wall mounting
  • Approved for zero clearance to combustibles
  • ASME Certified
  • Stainless Steel Fire Tube Heat Exchanger 
  • Secondary heat exchanger for endless hot water

Performance Specifications of INS155C Instinct Solo Boiler:

FuelNatural / Propane

Input Modulation MBH: 19.375 - 155
AFUE Rating95% 
DOE Heating Capacity MBH: 143
Net AHRI Rating MBH: 124
Water Volume Gal.: 3

Domestic Hot Water Performance/Specifications of INS155C Instinct Combi:

DHW Minimum Flow Rate (GPM)0.5
DHW Output GPM (70°F rise): 4.0
DHW Output GPM (80°F rise): 3.5
Domestic Connections3/4”


Connections/ Dimension INS155C Instinct Solo Boiler

Supply / Return Connections1”
Gas Connection3/4” 
Vent & Air Connections3”
Dimensions21 5/8” x 16 ¾” x 26” 
Weight (Empty): 121 Lbs
Electrical Requirements120VAC 60Hz 15A Full Load

Approvals of INS155C Combi 

  • 95% AFUE Efficiency
  • ENERGY STAR Qualified
  • ANSI Z21.13 and CSA 4.9 Boiler Standards Compliance
  • ASME Boiler Certification – ASME “H” Stamp
  • SCAQMD 2012 Low NOx Certification

Watch how Triangle Tube's High-Efficiency boiler is produced with a "No-Fault Forward"

Documents and guides: 

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Disclaimer: Must be installed by a licensed contractor or warranty is void.


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