• 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 included
• 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
• Water flow switch (KW 399 - 850 only)
• Temperature & pressure gauge
• Drain valve
• Electronic PID modulating control
• Large user-interface and display
• Accepts external (4-20 mA or 0-10 V with supplemental kit) modulation signal
• On/off service switch
• Manual reset high limit
• Burner site glass
• Zero clearance to combustible surfaces
• Built-in cascade function for up to eight Keystone water heaters

Triangle Tube is best known for two things: feats of hydronic innovation and incredibly efficient products. If you are looking for those qualities in your water heater, the Keystone certainly fits the bill. The Keystone tankless water heater is a high-efficiency, condensing water heater for large spaces. The condensing technology behind the Keystone will capture and reuse gaseous heat that escapes traditional water heaters. Stainless steel construction of the heat exchanger and an internal condensate trap will protect the KW 285 from corrosion. The Keystone's modulating burner scales heat production based on your needs and reduces unnecessary energy consumption. All told, the Keystone is an incredibly reliable and efficient water heating solution.

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.