Triangle Tube INSFS155C Instinct Combi Boiler 155,000 BTU (Floor Mount)

Product Description

Triangle Tube INSFS155C is an Instinct combi floor-mount condensing boiler that provides space heating and domestic hot water. The unit features an all stainless steel fire tube heat exchanger, 19,375–155,000 BTU input range, 95% AFUE, 8:1 turndown, and a 3 gallon internal water volume. It includes a 3-in-1 vent adapter, propane conversion kit, CTRLMAX control with 60-second EZ setup, and supports cascading up to six boilers.

• All stainless steel fire tube heat exchanger; 19,375–155,000 BTU input, 95% AFUE, 8:1 turndown; DOE heating capacity 142 MBH, Net AHRI 123 MBH
• CTRLMAX control with 60-second EZ setup, Tsync Wi-Fi connectivity and pre-installed internal circulator pump; compatible with Caleffi 548 series separator
• 3-in-1 universal vent adapter (accepts PVC, polypropylene, stainless steel), propane conversion kit included; supply/return 1" MNPT, gas 3/4" MNPT, vent/air 3"

Product Highlights

Floor-mounted condensing combi boiler — 155,000 BTU max input, 95% AFUE, 3 gallon water volume, cascade-capable

Product Information

Standard Information

• Brand: TRIANGLE TUBE
• Manufacturer Part Number: INSFS155C

Technical Specifications

• Brand: Triangle Tube
• Model Number: INSFS155C
• MPN: INSFS155C
• Product Type: Combi boiler (floor mount)
• Fuel: Configured for natural gas (propane conversion kit included)
• Input BTU Min: 19,375
• Input BTU Max: 155,000
• AFUE: 95%
• Turndown Ratio: 8:1
• DOE Heating Capacity (MBH): 142
• Net AHRI Rating (MBH): 123
• Water Volume (gallons): 3
• Supply/Return Connections: 1" MNPT (1-1/4" FPT when using 548 separator)
• Gas Connection: 3/4" MNPT
• Vent/Air Connections: 3"
• Max Vent Length (2in): 33' (396 in)
• Max Vent Length (3in): 100'
• Weight (lbs): 181
• Dimensions (W x H x D): 22" x 41" x 22"
• Control System: CTRLMAX with 60-second EZ Setup
• Heat Exchanger: All stainless steel fire tube
• Caleffi Separator Compatibility: Caleffi 548 Series separator with air elimination
• Built-in Circulator Pump: Pre-installed internal primary circulator pump
• Tsync Wi-Fi Connectivity: Tsync Wi-Fi
• DHW Output GPM (70F Rise): 4
• DHW Output GPM (75F Rise): 3.7
• DHW Output GPM (80F Rise): 3.5
• DHW Min Flow Rate (GPM): 0.5
• DHW Max Operation Pressure (PSI): 150
• CH Max Flow Temp (F/C): 185 F (85 C)
• DHW Max Flow Temp (F/C): 150 F (65 C)
• Cascade Capability: Up to 6 boilers
• Vent Adapter: 3-in-1 universal vent adapter (accepts PVC, polypropylene, stainless steel)