PIROBLOC thermal fluid heaters are adapted to the regulations in force in every territory. They are high tech thermal fluid heaters and totally customized in agreement with our customer’s needs:

  • Horizontal or vertical execution. There is no functional difference between a horizontal thermal oil heater and a vertical thermal fluid heater, being the decision subject to the available space in plant and height, and to the ease of maintenance.
  • Our thermal fluid heaters provide heat through liquid fuel (HFO, light oil) and/or gaseous (natural gas, propane, etc.). A thermal fluid 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 fluid heating system has numerous benefits, being the following the main ones:

  • Safety. Our thermal oil boilers 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.


Technical features

  • 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.

Standard components

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

Optional executions

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

Applications of a thermal fluid system

  • 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


Our thermal fluid heaters are cylindrical envelope, arranged to raise the temperature of the thermal fluid circulating in two concentric coils, by combustion of liquid fuel in a burner which sits in the front cover. Between the two casings there is rockwool insulation which allows low temperatures (around 86ºF to 104°F) in the outer shell, thereby achieving minimal structural losses and preventing burns from unintentional contact with the boiler.

The burner flame is projected therefrom to the combustion chamber and as per the combustion regulation it can hit the ceramic hearth – back cover on the inside – closing the chamber. Then it changes direction and the combustion gases circulate at high velocity and turbulence between the two coils until the front cover, where they change direction again until its evacuation by the chimney located at the end of the casings.

The coils are made up of two, three, four steps or even more depending on the model, being essential high-speed flow of thermal fluid to achieve good heat transfer and to avoid its “cracking”.

Initially, the thermal oil circulation is by the outside coil (where the heat is transmitted almost exclusively by convection) to pass then, into the internal coil (where the heat is transmitted almost exclusively by radiation) achieving excellent energy yields.

The front cover serves on the inside part as closing of the gas flues between coils and has holes for the passage of the coils tubes that are connected to the general collectors, connecting with 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.

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