U.S. Boiler Citadel
condensing boilers
U.S. Boiler has expanded and improved its line of Citadel condensing boilers and volume water heaters. The Citadel is now available in seven capacities from 399 to 1,500 mBh, all with 10:1 turndown. AHRI certified and rated up to 97% thermal efficiency (98% for the water heater), the Citadel is available in natural gas and propane configurations. Citadel boilers 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. Also new is the
