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KS500 475,000 BTU Output Keystone Condensing Boiler

Name: KS500 475,000 BTU Output Keystone Condensing Boiler
Brand: Triangle Tube
SKU: KS500
Price: 13324.92 USD
Availability: OutOfStock

Brand:

Triangle Tube

SKU:

KS500

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KS500 475,000 BTU Output Keystone Condensing Boiler

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KS500 has been discontinued

Discontinued April 29, 2022

This product was discontinued because the part number was changed by the manufacturer. No modifications were made to the replacement product.

MANUALS (2)

Product Overview

Replacement Parts List

Product Overview

Replacement Parts List

Schematic Feature!

Replacement Parts

Direct Replacement:

KS500T 475,000 BTU Output Keystone Condensing Boiler

Brand:

Triangle Tube

SKU:KS500T

(0)

VIEW REPLACEMENT

Product Highlights

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475000 Max BTUs

Propane, Natural Gas

Direct Vent

Hydronic (Water)

500000 BTUs

24-1/2" Width

Description

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Heating equipment must be installed, commissioned, and serviced by a licensed and qualified professional in accordance with manufacturer instructions, applicable codes, and industry standards. Manufacturers do not accept warranty or technical support requests from homeowners or unlicensed individuals. All warranty and technical inquiries must be initiated by the licensed professional responsible for the installation.

The Triangle Tube brand has been discontinued by the manufacturer as of 11/3/2025. Suggested replacement units will be available on our website and replacement parts will continue to be available as supplies last. If you'd like any further assistance, please contact our customer service team.

Note: Product Title reflects this boiler's DOE Output Rating

Triangle Tube's Keystone Series Condensing Boilers are designed for large residential and light commercial applications. The stainless steel heat exchanger and burner provides high efficiency, low emissions, and a high turndown to minimize short cycling. With maximum inputs of 850 MBH for boilers and 500 MBH for water heaters, the Keystone series can meet most needs with a single unit. For larger requirements the advanced control allows units to be joined and function with parallel modulation for maximum efficiency.

Features:

Energy efficient with 95% to 97% Thermal Efficiency

Stainless Steel Heat Exchanger

CSD-1 Standard on 500 to 850 MBH Boilers

Integrated Cascade

Multiple pump control and thermostat inputs

5 to 1 Turndown

75 psi Pressure Relief Valve on Keystone Boilers

Specs

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Fuel Type:	Propane Natural Gas
Efficiency:	95%
System Type:	Hydronic (Water)
Vent Type:	Direct Vent
Gas Connection:	1"
Features:	Condensing EI/Spark Ignition
Water Connection:	1-1/2"
Air Intake:	4"
Vent Diameter:	4"
BTU Input:	500000
BTU Output:	475000
DOE Rating:	475000
Combustion Efficiency:	95.6
Width (Inches):	24-1/2"
Height (Inches):	38"
Depth (Inches):	37"