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                              WA# NWINDMI062BE  OR CCB#  96672  ID#  RCE-17032  CA#  726315  NV#  0062228  DUNS#  82-513-4612

​Capacities: 12 – 100 BHP

Inputs from 480,000 to 4,035,000 BTUH

Outputs from 400,000 to 3,350,000 BTUH​


​Capacities: 12 – 100 BHP

Inputs from 480,000 to 4,035,000 BTUH

Outputs from 400,000 to 3,350,000 BTUH


Classic Series Three Pass Firetube

​​A3S • A3S4 • A3S5 • AHFRC • A3SL

   A3S :  17-120 BHP

​Capacities: 135 – 200 BHP

Inputs from 5,450,000 to 8,100,000 BTUH

Outputs from 4,520,000 to 6,695,000 BTUH


Steam Boilers 

Capacities: 15 – 200 BHP

Inputs from 600,000 to 8,100,000 BTUH

Outputs from 500,000 to 6,695,000 BTUH


   A3SL :  135-200 BHP

 AHFR :  17-120 BHP  

  • Modified Three-Pass Scotch Marine “Scotch Box” Boiler
  • Fuels: Gas • Oil • Combination Gas/Oil • Digester Gas
  • 15 PSI Steam / 30 PSI Water Design
  • 83 – 88% Efficiency
  • “U-Type” Flex Joint
  • Thermal Shock Resistance
  • Expanded/Flared Tube Attachment or Welded
  • Water Surrounded Cylindrical Furnace For Highest Heat Transfer
  • Water Cooled Reversing Chamber 4-Sided Wetback
  • Insulated Boiler with 18 Gauge Boiler Jacket
  • 15 PSI Steam / 30, 40 & 80 PSI Design Water Options
  • 83 – 88% Efficiency
  • Inventor of the “Scotch Box” Design
  • “U-Type” Flex Joint
  • All Steel Construction
  • Thermal Shock Proof Resistance
  • Water Surrounded Cylindrical Furnace for Highest Heat Transfer
  • Water Cooled Reversing Chamber 4-Sided Wetback
  • Capacities: 12 – 200 BHP
  • Models up to 120 BHP Fit Through 36” Doorway
  • Fuels: Gas • Oil • Combination Gas/Oil • Digester Gas
  • Structural Channel Base
  • Optional Field Erect Boilers
  • Ideal for Multiple Boiler Installations
  • Package with Aldrich Boiler Management Panel for Highest System Efficiency
  • Ease of Maintenance, Access to Fire Side

​​​​Main Office:  (360) 256-0923

Fax:  (360) 256-9104
2911 NE 109th ave.  Vancouver, WA 98682

   AHFRC :  17-120 BHP

​Capacities: 17 – 120 BHP

Inputs from 695,000 to 4,865,000 BTUH

Outputs from 580,000 to 4,040,000 BTUH


   A3S5 :  12-100 BHP

   A3S4 :  15-200 BHP

Capacities: 17 – 120 BHP

Inputs from 695,000 to 4,865,000 BTUH

Outputs from 580,000 to 4,040,000 BTUH

Aldrich Company manufactures three pass and vertical firetube steam boilers for low pressure applications. The Classic Series modified Scotch Marine “Scotch Box” boiler is designed to fit through a standard doorway.

Classic Series – Three Pass Firetube Boiler