• High heat exchanger condensing efficiency
• Modulation down to 20% of full fire (5:1 turndown)
• Sealed combustion chamber
• Pre-mix stainless steel burner
• Low NOx system exceeds the most stringent regulations for air quality – less than 10 ppm NOx
• Horizontal or vertical direct vent
• Horizontal vent and air terminals
• Vent and air pipe lengths of up to 100 equivalent feet (each)
• Built-in condensate trap
• Vent temperature cutoff feature
• Direct spark ignition system
• Sensor for domestic water tank
• 160 psi maximum working pressure
• Stainless steel heat exchanger with welded construction (no gaskets)
• ASME "H" stamp
• 125 psi (861 kPa) ASME rated pressure relief valve
• Temperature & pressure gauge
• Drain valve
• Water flow switch
• Electronic PID modulating control
• Large user-interface and display
• Alarm output
• Accepts external (4-20 mA or 0-10 V) modulation signal
• On/off service switch
• Manual reset high limit
• Burner site glass
• Zero clearance to combustible surfaces

Keystone Condensing Water Heaters produce high volume hot water in with high energy efficiency. With 4 models with inputs from 199 to 500 MBH the Keystone Condensing Water Heaters are perfectly sized for large residential and light commercial applications. These products feature a stainless steel heat exchanger with a thermal efficiency between 95 and 97%. Their compact design minimizes floor space while the cabinet provides easy access to all components. The large user friendly control interface makes set-up easy. The advanced control modulates the water heater with a 5 to 1 turndown ratio. Up to 8 water heaters can be joined in a cascade while the control features parallel modulation and water heater rotation to maximize efficiency and service life.

Triangle Tube Boiler Installation & Warranty Information

We recommend that the installation of all Triangle Tube Boilers and Water heaters be done by a licensed, trained and qualified technician with the proper knowledge and background.

Should you experience an issue during the installation or the initial startup of the unit, please do not contact the manufacturer. You should have the technician that installed the unit contact either us or the manufacturer. Triangle Tube cannot accept any service or warranty calls from anybody but a licensed technician.

Neither we or Triangle Tube can be held liable for improper installation and operation of any Triangle Tube boiler product purchased from our company. Should a warranty issue arise where parts will need to be replaced, an installation receipt will be required along with your sales receipt. Failure to provide a receipt or invoice may result in the warranty not being honored.