U.S. Boiler Company has expanded its line of Citadel condensing boilers and volume water heaters. The Citadel is now available in seven capacities from 399 to 1500 MBH, all with 10:1 turndown. AHRI certified and rated up to 97% thermal efficiency (98% for water heater), the Citadel is available in natural gas and propane configurations. Citadel boilers aim to conserve mechanical room space and simplify installation. They can be stacked two-high without the need for accessory racking systems. Zero side and top clearance optimizes heating capacity per square foot of mechanical room space.

The Citadel boiler’s is compatible with U.S. Boiler Company’s USB-Connect mobile app. Because the Citadel is designed for a variety of applications, it’s sold complete out of the box.  Included at no additional cost are the low water cutoff and high and low gas pressure switch, making the boilers CSD-1 compliant. A standard, reinforced 3-in-1 vent connector facilitates the use of polypropylene, CPVC or stainless steel venting. Venting of up to 100 equivalent feet on the exhaust and 100 equivalent on intake in AL29-4C, polypropylene or CPVC. Modbus communication comes standard. All models are suitable for indoor/outdoor installations.

For more information, please visit www.usboiler.net