• Efficiency:  Up to 87% AFUE, ENERGY STAR® Certified (EXB4075, EXB5100, EXB6130 and EXB7165)
  • Capacity: Multiple Firing Rates
    • 4 Section – 105 and 126 MBH
    • 5 Section – 140 MBH
    • 6 Section – 182 MBH
    • 7 Section – 231 MBH
  • Heat Exchanger: Cast Iron
  • Combustion: Atmospheric
  • Venting: Vertical or Direct Vent
  • Boiler Type: Hot Water
  • Boiler Control Module: Hydrolevel Fuel Smart HydroStat Control – combination Low Water Cutoff with boiler temperature reset and circulator control
  • User Display Interface: Digital display with easy-to-set dial-type limit settings
  • Heat Exchanger: High efficiency, cast iron, three-pass design with reversible swing door and target wall. Efficiency baffles/liner by model
  • Combustion: Oil burner with protective cover and a flexible oil line
  • Electrical: Wiring harness with Molex connectors and a burner electrical disconnect
  • Other
    • Temperature/pressure gauge
    • 3/4″ ASME relief valve
    • Drain valve
    • Textured painted steel jacket

  • Beckett or Riello Burner
  • Manual Reset High Limit with Plug-in Molex Connectors
  • Direct Vent

  • Easy-to-Service
  • Flexible oil line combined with an easy access heat exchanger with a dual-hinge swing door (right or left mount option)
  • Wide flue ways for easy cleaning
  • Sight glass for flame observation
  • Removable 1/4″ test port for draft overfire reading


Very pleased with the work and the way it performs.

Stephen Almy
Product Reviewed:
Excelsior EXB Series

Highly recommended by contractor and a great warranty.

Jody Rupert
Product Reviewed:
Excelsior EXB Series

So far it is quiet and efficent.

Glenn Barnes
Product Reviewed:
Excelsior EXB Series

I would recommend this product. This is not my 1st dunkirk boiler. I had one in a previous home that i owned. The contractor (Oms Heating & Plumbing) that installed boiler, I would highly recommend. He did a very neat and professional job

Paul Ott
Product Reviewed:
Excelsior EXB Series

Compact size, excellent price, functional.

Product Reviewed:
Excelsior EXB Series