Citadel, Available Now!
High efficiency commercial boilers and water heaters offering twice the power in half the space now available in 7 sizes!

High Eff. Gas Comm. Boiler or Water Heater Stainless Steel Heat Exchanger High efficiency commercial boilers and water heaters offering twice the power in half the space…
now available at your distributor!

RANGE OF SIZES

Citadel: 399-1000 MBH
Citadel XL: 1250 & 1500 MBH


SAVES SPACE

Small unit footprints, zero clearance (Citadel models)
Stackable/rack-able, doubles MBH/sq.ft.


STREAMLINES REPLACEMENT

3-in-1 vent connector (Citadel models), multiple venting options
Up to 300′ of venting (Citadel XL models, 200′ for Citadel models)
Simplified wiring – separate low/high voltage boards


SIMPLIFIED SPECIFICATION & INSTALLATION

CSD-1 built-in (gas train & controls)
Advanced ConcertTM control system
Touchscreen with intuitive navigation and menus
Cascade up to 8 boilers
Data/event logging
Modbus connectivity


RELIABILITY & SERVICEABILITY

Commercial-grade water tube heat exchanger
Easy access to all boiler service areas
Complete control panel access: slide out (Citadel models), external (Citadel XL models)

Product Date Sheet & Specifications

Technical Manuals & Information

U.S. Boiler Company is a leading manufacturer of home heating equipment, water boilers, steam boilers, hot water heaters, radiators and boiler control systems.