Thermal Oil Heaters

Thermal Oil Heaters (also called Thermal Oil Boilers, Thermal Fluid Boilers, Hot Oil Units) are developed and designed especially for demanding process heating  operations where no compromise on quality are accepted and where reliability is the key word.


The heater solution from RA are not characterised by low purchase price – but instead low over-all costs including low maintenance and operational costs, and long life-times.

Oil & Gas-fired Unit

Consequently Oil heaters are made of first class material and component, without any compromise on quality. The pressure part are designed as standard between 10 bar (although operation often are atmospheric and unpressurised).

The heaters for thermal oil or heat transfer fluid (HTF) are delivered as complete and fully equipped units with all necessary armatures, instrumentations and safety features.

The thermal oil heaters are delivered as oil-fired, gas-fired, or dual fuel. The models are designed for minimum 10 bar pressure with capacities in normal range up to 500 kW, – and up to 4000 kW.

Water and steam are typically used as heat carriers (heat transfer fluid) in heating systems. But at high temperatures which is often required in process heating systems, water and steam requires a corresponding high operating pressure. Consequently high temperature heating systems with water and steam can be very controversial and expensive – both in relations to personal safety issues, economy, design and projecting.


In thermal oil heaters, a special oil-based fluid is used instead of steam or water as the heat carrier. With this oil it is quite simple to achieve operating temperatures up to 250°C at atmospheric pressure. Comparing to water and steam, this would require a pressure above 85 bar to obtain this temperature.


There are several advantages by using thermal oil compared to steam systems. The most obvious are:

  • High temperatures up to 250°C at atmospheric


  • Optional temperature level set-points
  • No pre-treatment required
  • No heat loss (in form of condensate and flash steam)

No risk of corrosion and no risk of freezing damages.

  • Low maintenance costs
  • Quiet in operation (no steam stroke and flash steam noise)
  • Easy to operate (does not require steam boiler certified staff)
Boiler Auxiliaries

for Higher efficiencies and heat recovery

  • De-aerator Tanks
  • Economizers
  • Blow down Vessels
  • Condensate Recovery Systems
  • 3 Way Diverter Valves
  • Shutoff Valves
Package Type Steam Boilers, Wet Back,
Three pass, fire tube design.

Razzaq Associates selection of Industrial Boiler systems includes Steam Boilers and Waste Heat Boilers. Balancing the best design with technological innovation, the ranges comprise products unrivaled in build quality, durability and precision control capability.

Razzaq Associates has built a reputation as producer of performance Boilers, combining high quality manufacturing processes with a precision for exploring new ideas and technologies largely ignored by longer established competitors.

As a result not only our high efficiency boilers are more cost effective and safer than any others – making them preferred choice of an increasing number of customers.

Razzaq Associates always refuse to compromise quality for price and continue to retain all manufacturing processes, from plate rolling to final fitting, under strict quality control, in our fully equipped workshop.


  • Model : Thermpac
  • Boiler Type : Three Pass, wet back, fire Tube.
  • Output : 1000 Kg/hr up to 16000 Kg/hr.
  • Working Pressure : 10, 12, 14, 16 & 18 Barg.
  • Typical Efficiency : Up to 92% (based on net calorific value)
  • Fuel Type : Solid , Liquid and Gas
  • Manufacturing Codes : ASME 1, BS2790 Certified by SGS or Bureau Veritas
  • All Thermpac Boilers are sold fully Packaged with European mountings, Grundfoss

Pumps and a choice of Burners from leading manufacturers , fully fitted and wired. A Ladder and Gantry system is included as standard on all Boilers.

Waste Heat Recovery Boilers

Our designed waste heat recovery boiler is to achieve optimum performance at given heat available and the Boiler output required.

Waste Heat Boilers can operate in a range of application recovering heat which is produced mainly by Engines and Turbines as an exhaust.

Razzaq Associates waste heat recovery Boilers are designed to suit each unique installation, the design team being the leading authority in this field. The WHR Boilers are available with different steam outputs according to exhaust flow and temperature.

Razzaq Associates also design  and manufacture composite  Boilers. These have a gas or oil fired burner as the primary energy source, supplemented by Waste heat when available.  Alternatively waste heat may be the primary source topped up by a burner when required.

Razzaq Associates Waste Heat Recovery Boilers are preferred by engineers across many industries including Textile, Food and Beverages, Chemical process, wood and Paper.

All WHR Boilers manufactured on ASME1 standard and Certified by SGS or Bureau Veritas.

Our WHR Boilers are sold fully Packaged with Motorized Diverter valve, Isolation valve, ducting, European mountings, Built in Economizer for greater efficiency, Grundfoss Pumps, mimic based panel with top of the line instruments. A ladder and platform is included as standard on all Waste Heat Recovery Boilers.

Heat Exchangers

Razzaq Associates is specialized in shell tube Heat exchangers for heating and cooling process fluids. Our Heat exchangers application include condensers, reboilers, process heaters and coolers

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