Thermal oil Heaters

Thermal oil Heater ASME

PIROBLOC thermal oil heaters are adapted to the regulations in force in every territory. We manufacture high range, totally customized thermal fluid heaters to satisfy our customers’ needs::

  • Horizontal or vertical execution. There is no functional difference between a horizontal thermal oil heater and a vertical thermal fluid heater, with the choice being made according to the available space and height in the plant, and ease of maintenance..
  • Our thermal oil heaters provide heat through liquid fuel (HFO, light oil) and/or gaseous (natural gas, propane, etc.). A thermal oil heater is the main component in a thermal fluid heating system, where a liquid fuel is heated and circulated to provide energy to different energy users within a closed circuit.
  • Features: Automatic running of the heater and indirect surveillance.

A thermal oil heating system has numerous benefits, being the following the main ones:

  • Safety. Our thermal fluid heaters operate without pressure and water. This avoids the typical problems related to steam heating systems, such as leaks, corrosion, water treatment, etc.
  • Thermal oil heaters require low maintenance.
  • Fuel savings up to 20% compared to steam heating systems. A thermal fluid system consists of a closed circuit with minimum energy leaks. At least 90% of the fuel is used in the heating process.
  • Thermal oil heating systems are highly efficient thanks to the temperature uniformity through all the production process.


• Power range: From 0,1 to 15 MW
• Admissible maximum pressure (PS): 40 bar
• Test pressure (PT): 60 bar
• Service maximum pressure (PMS): 25 bar
• Service temperature: till 400ºC
• Design temperature: 400ºC
• Two coils, three smoke passes
• Fluids content: thermal fluids. Group 1
• Surveillance system: Indirect
• Control interval: till 24 hours
• Class according with Directive 2014/68/UE
• Design Code: ASME VIII, Div 1, EN 13445, AD 2000, etc.


• Allweiler thermal fluid pump
• Weishaupt burner
• Control panel with Siemens/Télémécanique PLC and touch screen
• Wika pressure transmitters
• Ari valves


  • Temperature up to 400º C
  • Folding doors
  • Fire prevention inlet for N2 or steam
  • Remote assistance
  • ATEX execution
  • “Custom” executions


Our thermal oil heaters are of cylindrical shape, arranged to raise the temperature of the thermal fluid circulating in two concentric coils by combustion of liquid fuel in a burner located in the front cover. There is high density rockwool insulation between the two casings for low temperatures (30-40°C) in the outer casing, thereby achieving minimal structural losses and preventing burns from unintentional contact with the boiler.

The burner flame is projected therefrom to the combustion chamber, which has been sized according to the geometry of the flame. The closing of the chamber is done by refractary. It then changes direction and the combustion gases circulate at high speed and turbulence between the two coils to the front cover, where they change direction again until evacuated by the flue at the end of the casings.

The coils are made up of two, three, four or more steps depending on the model; as high-speed flow of the thermal fluid is essential for good heat transfer and to prevent it cracking.

Initially, the thermal fluid circulates in the outside coil (where the heat is transmitted almost exclusively by convection) before transferring to the internal coil (where the heat is transmitted almost exclusively by radiation), thus achieving excellent energy performance.

The inside part of the front cover closes the gas flue between the coils and has holes for the passage of the coil tubes to be connected to the general collectors, connected to the circuit by flanges.

It also closes the combustion chamber where the burner is fixed. It is equipped with a manhole for access to the combustion chamber if necessary.


• Reactors
• Warm asphalt / bitumen
• Storage tanks / port terminals
• Paintings
• Adhesives and glues
• Plastic and rubber
• Chemistry industry
• Oils and fats
• Drying processes
• Beer
• Evaporators
• Wood drying
• Waxes
• Distillation columns
• Resins
• Exchangers
• Solar energy
• Mining
• Stamping tunnels
• Presses
• Flexography and gravure
• Inks drying
• Precooked
• Industrial bakery
• Lubricants
• Heating of ironers
• Sludge drying
• Meat industry
• Biodiesel
• Chips
• Nuts
• Snacks
• Industrial pastry
• Polyurethane
• Aviation industry
• Universities
• Research centers


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