Series 400

Three-Pass Wetback Scotch Marine Boilers

The Hurst 400 Series three-pass wetback scotch marine boiler is an ideal choice for all commercial and industrial applications when engineering mechanical systems using the latest HVACR technologies. The Hurst 400 Series Boiler provides fuel efficiencies that exceed most four-pass designs. Having no large refractory rear door, these boilers allow one technician easy access to all tubes. The boiler' front doors can be opened without removing any burner components or controls.

Capacities range from 15 to 2,000 HP and 1004 to 50213 MBTU/HR. Available for 15 PSI Steam and 30 PSI Water (60 PSI Water Optional).

  • Factory assembled, prewired and tested
  • No field assembly required
  • UL listed boiler/burner packages
  • Fully assembled, prepiped, prewired, pressure tested gas trains
  • Complies with ASME, UL, CSD-1 and ASHRAE standards
  • High efficiency, low stack temperatures
  • Customer service support through national network of sales, service, start-up, training and parts by factory representatives.


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Our complete line of boiler room equipment includes a wide range of boilers, burners, hot water heaters, feedwater systems, blowdown systems, fuel efficient equipment, control systems, oil heaters and stack systems.

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Hurst Boiler & Welding Company

Hurst Boiler offers a complete product line of natural gas, oil, digester gas and off gas fired steam and hot water boilers, as well as a broad array of ancillary equipment including blowdown separators, surge tanks and pressurized feedwater tanks.

  • Scotch Marine (firetube)
  • Firebox
  • Vertical tubed & tubeless boilers
  • Feedwater systems
  • Blowdown separators
  • Deaerator systems
  • Solid fuel fi red boilers
  • Hybrid HD series