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Aldrich Boilers – KG Series

Capacities: 10 – 42 BHP
Inputs from 405,000 to 1,750,000 BTUH
Outputs from 324,000 to 1,400,000 BTUH
80% Efficiency


Aldrich company manufactures a full array of hydronic boilers for the commercial heating market, including high efficiency condensing boilers, near-condensing boilers designed to improve energy efficiencies, horizontal firetube boilers and vertical firetube boilers.

  • K = Oil Fired, KG = Gas Fired
  • Vertical Firetube Boiler
  • 30, 100, & 150 PSI Design
  • All Steel Construction
  • Engineered with Water Surrounded Furnace
  • Optional Heat Exchanger (Tankless Coil) for Indirect Loads
  • Insulated Boiler with 18 Gauge Boiler Jacket


The “K & KG” include a low stress thermal shock resistant single pass vertical design. With thousands of boilers installed worldwide this has proven to be a robust boiler design.

Primary flue gases pass via water backed heat transfer tubes. No refractory backed finned passages to burn out.

The “K & KG” Series may be factory constructed with an integral copper finned heat exchanger allowing the boiler the ability to provide both direct heating and indirect heating.

The forte of Aldrich Company has always been to only manufacture products of the highest quality and design, by using the finest materials available and employing loyal craftsmen with the skills and aptitude necessary towards this end. They outsource no sub-assemblies and They procure only domestic steel and tubing to fabricate their pressure vessels. All Aldrich boilers and water heaters are constructed and stamped to Section IV of the ASME code and registered with the National Board of Pressure Vessel Inspectors.


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