Specialised Products

We tailor the solution and manufacture products to your specific requirements. 

Waste Heat Boilers

The O’Brien Energy Waste Heat Recovery System can be used to generate steam or high temperature hot water. The energy otherwise wasted can be reused to improve site energy efficiency and reduce the carbon footprint while creating a more sustainable heat plant. There are typical combinations of an exhaust gas or waste heat unit with a direct fired steam generator. A principal feature of the O’Brien Energy Waste Heat Recovery System is its unique coil design. The coil tube is wound in a spiral pattern with closely controlled spacing between turns. This provides the desired area to control the velocities of the boiler gases. This highly efficient heating surface arrangement minimizes size and weight requirements.

The O’Brien Energy Exhaust Gas Boiler (EGB) is primarily used in conjunction with a Prime Mover, such as a Turbine or Internal Combustion Engine (100 kW to 15 mW), as part of a Distributed Generation installation producing electricity or in marine/shipboard applications. The typical O’Brien Energy EGB is constructed of individual coil modules, with each module containing spirally wound layers.

The number of modules used depends upon the exhaust gas flows, allowable back pressure and on the boiler heat output requirements in steam or hot water. The O’Brien Energy EGB module is available in various sizes and configurations to meet individual requirements. O’Brien Energy EGB modules can operate at temperatures up to 650 °C and can run dry (without circulating water in the tubes) at temperatures up to 450°C. Once assembled with the appropriate coil modules, the completed O’Brien Energy EGB includes inlet and outlet cones that permit vertical or horizontal units with exhaust gas flows in any direction.

Electrode Boilers

Model CEJS

Capacity in KW

Up to 65,000 kW

Steam Production in kg/h

Up to 100,000 kg/h

Design pressure

7-34 bar


High-voltage electricity


The Model CEJS is a high-voltage, jet-type electrode steam boiler that utilizes properties of water to conduct electrical current and generate steam. The CEJS electrode boiler design includes a fully automated PLC that provides modulation and control to produce high volumes of steam. Simple to operate and maintain, all electrical energy is converted to heat. Automatic controls reduce the operating personnel requirements. No stack is required, with no emission of greenhouse gases.

Available in sizes ranging from 2 MW to 65 MW, with operating pressures from 7 up to 34 bar.


Biomass Boilers

Biomass fired installations are frequently supplied with fuels coming from Forests or sawmills. The size and moisture content of the fuel can vary considerably. The variability is critical in a network of heating installations where the fuel is supplied from various suppliers and sources.

The Biomass boiler has been designed and built to operate with solid fuels with a moisture content of up to 55%. The boiler can be supplied with 3 different types of combustion systems, which are; Model Biomass US with Under Feed Stoker for fuels up to 30 mm with a moisture content of up to 30% Model Biomass SG for fuels of up to 30 mm with a maximum moisture content of 55% utilising a screw fed Step Grate system of combustion.

Model Biomass LF for fuels 50 mm x 50 mm x 300 mm with a moisture content of up to 55% which utilises an hydraulic ram to feed the Step Grate system of combustion.

The boiler has been designed to produce Low Temperature and Medium Temperature Hot Water with operating pressures of 2 bar, 5 bar and 12 bar g. These pressures will allow operation temperatures up to 95 deg C, 130 deg C and 150 deg C respectively and designs conform to either EN 303 or PED as determined by the operating temperature required. The design of the boiler is essentially four passes, with two passes being completed within the combustion chamber and a further two passes in the gas passes of the heat exchanger. The large combustion chamber is a feature of the boiler creating high combustion temperature, long residence time in the furnace to ensure a quiet combustion process and low emissions. Whilst the models Biomass US and Biomass SG utilise screw feed for particle size up to 30 mm, the LF version using an hydraulic ram feeder system has been developed to accommodate larger sizes of timber up to 50 mm x 50 mm x 300 mm. The boiler control system incorporates user friendly software for reliability and ease of operation and control of the boiler system.