U.S. Boiler Company introduces the all-new Citadel and Citadel XL condensing boilers and volume water heaters. The Citadel is available in five capacities (399 - 1000 MBH) and the Citadel XL is available in 1250 and 1500 MBH capacities. AHRI-certified and rated up to 97% thermal efficiency (98% for water heater), the Citadel is available in either a natural gas or propane configuration. The new boilers save time, space and simplify design and installation. The Citadel can be stacked two-high without the need for accessory racking systems, while the Citadel XL can be stacked with a rack system. Zero side and top clearance optimizes the amount of BTUs that can offer per square foot.

U.S. Boiler Company

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