• 770.777.2570

Thermal Fluid Heaters - In Stock!

Need a heater quick?  We have Hot Oil Heaters in stock. For sale or rent. Call (770) 777-2570 today!

Fire Tube Boilers - Two Pass Dry Back (FT)

Product Code: FT, FT-PA, FT-ECO

Product Specifications

Capacity Range:

  • 70 to 425 BHP(69 to 4146kW)

Steam Production:

  • 1,100 to 13,200 lb/hr (500 to 6,000 kg/hr)

Operating Pressures:

  • 130-160 psi (9-11 bar)

Fuel Option:

  • Natural Gas
  • #2 Fuel Oil/Diesel
  • Light Fuel Oils
  • LPG
  • Dual Fuel
  • Additional Fuel Options Available


  • Horizontal

Two Pass, Dry Back Design

Thermal Efficiency

  • Up to 93%

Combustion Air Preheater Optional

  • Model FT-PA

Economizer Optional

  • Model FT-ECO

Fire Tube Boilers - Two Pass Dry Back (FT)

Product Description

The FT Fire Tube Boilers are our economical direct fired two pass dry back boilers. The burner fires down the center of the fire tube, which is located either on the left or right side of the boiler. The flame travels down the fire tube and enters the inversion chamber. The exhaust gases then travel from the inversion chamber through the combustion tubes and exit the boiler through the exhaust stack. The dry back design refers to the use of refractory at the back of the boiler in the inversion chamber.

The FT Fire Tube Boilers is specifically designed to minimize the thermal stress on the boiler not only at high pressures, but at low pressures as well. Cutting edge technologies are used to construct the fire tube boilers that help reduce the thermal stresses that occur when operating the boiler. In addition, the fire tube boilers are designed with a large thermal inertia, allowing for fluctuations in steam production and is ideal for continuous processes.

The FT has the opportunity to be supplied with a variety of forced draft burners, provided by some of the world’s leading burner manufactures. This allows us to utilize a variety of fuels, meet stringent emissions requirements and even allow our customers the opportunity to select the burner of their choice.

The FT-PA is our high efficiency option of the FT Fire Tube Boiler. The FT-PA is constructed in a horizontal orientation and is supplied with a combustion air preheater at the burner side of the heater.

The FT-ECO is our feed water preheater option of the FT Fire Tube Boiler. The feed water preheater utilizes and economizer to preheat the water entering the steam generator. This in turn, enables the customer to obtain optimum performance of the generator by supplying the necessary feed water temperatures to the Fire Tube Boiler.

The BONO FT, FT-PA and FT-ECO Fire Tube Boilers are fabricated by our partner in Italy, BONO Energia and are available designed/constructed to various local code requirements around the world. The most common codes are ASME with National Board registration for the United States, CRN for Canada and CE/PED/TUV/DIN for Europe. Additional code requirements may be met if necessary.

Package and containerized systems are available for both the FT, FT-PA, and FT-ECO Fire Tube Boilers. These package systems can be customized to meet each of our customers’ needs, including but not limited to: control panel, feed water pumps, feed water tanks, deaerator, water treatment, and ancillary components. These auxiliary components are typically fabricated in the USA for USA/Canada installations.  

Fire Tube Boilers In General

Fire tube boilers are a form of large water content boilers used to provide customers with steam as a heat transfer media. Typically, the quality of steam provided by these units are much higher than forced circulation steam generators. The higher quality of steam mitigates the use of steam separators or steam accumulators.