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Fuel Type

To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.

Indirect Fired (7)

Natural Gas (17)

DOE Heating Capacity (BTU)

Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.

70000 - 89999 (2)

90000 - 109999 (4)

110000 - 129999 (2)

130000 - 149999 (3)

150000 - 169999 (1)

170000 - 189999 (2)

210000 - 229999 (1)

270000 - 289999 (1)

370000+ (1)

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Net I=B=R Capacity (BTU)

I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.

60000 - 79999 (2)

80000 - 99999 (5)

100000 - 119999 (1)

120000 - 139999 (4)

140000 - 159999 (2)

180000 - 199999 (1)

240000 - 259999 (1)

320000 - 339999 (1)

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Maximum Input Capacity (BTU)

The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.

80000 - 99999 (2)

100000 - 119999 (4)

120000 - 139999 (1)

140000 - 159999 (4)

160000 - 179999 (1)

180000 - 199999 (2)

240000 - 259999 (1)

280000 - 299999 (1)

380000 - 399999 (1)

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Product Line

Challenger Solo (4)

Instinct (5)

Prestige Excellence (1)

Prestige Solo (7)

Smart (7)

AFUE (%)

AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More

92 (1)

93 (3)

95 (12)

Storage Volume (Gallons)

119 (1)

28 (1)

36 (1)

46 (1)

56 (1)

70 (1)

95 (1)

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First Hour Delivery (Gallons)

Sometimes called First Hour Rating, this is the number of gallons of hot water the heater can supply per hour when starting with a fully heated tank. The recovery of the water heater depends on your boiler's BTU and boiler output temperature.

200 - 259 (1)

260 - 319 (1)

320 - 379 (1)

620 - 679 (1)

680 - 739 (1)

740 - 799 (1)

860 - 919 (1)

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DHW Production

DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.

No (14)

Yes (3)

Vent Type

Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.

Direct Vent (17)

Mount Type

Wall (17)

Medium

Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.

Hot Water (24)

Combustion Type

Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.

Condensing (17)

Modulating/Staging

Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control. Learn More

Modulating (17)

Brand

Triangle Tube (24)

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

Model: INS155C

Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity. Includes Circulator.

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$2,199.00

In-Stock

Free Shipping & Lift Gate

*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.

2% Check Discount

Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.