Installed in a sequenced modular configuration, TRIAD steel boilers come online only as needed, maximizing fuel economy and minimizing boiler vessel wear. Each boiler can be fired at up to 1 million Btus, and TRIAD burners can fire gas, oil or gas/oil dual fuel. The 125 psi (8.6 bar) fire-tube boilers can be configured to deliver space heating, domestic hot water or a combination of both from one vessel. The optional hot water coil is exceptionally rugged. A 97-foot (29.6 meter) copper coil is indirectly heated by boiler water rather than direct flame, for long life, and delivers hot water at 15 gallons per minute. TRIAD Boiler Systems, Inc.