Forced Draft & Pressure Jet floor standing pressurised steel boiler


The PREXTHERM RSW Quadra series heat generators are pressurised combustion boilers with flame reversal in the combustion chamber and three flue gas passes.


  • Technical Data


    Models Available from 92kw to 6000kw (6MW)

    Boiler body made entirely from steel, completely lined with an 80 mm layer of high density glass wool, in turn covered by a strong layer of tearproof material.

    Maximum operating pressure 6 bars, higher pressures upon request.

    Pressurised combustion chamber, completely cooled and protected by a system ensuring uniform division of the cold system return water, to avoid dangerous temperature differences. The burner is not aligned with the combustion chamber but rather has been moved downwards. This assists flame reversal, reduces the flue gas pressure drop and consequently extends the hot water generator’s range of application.

    Tube bundle placed above the furnace so as to guarantee the flue gas passes through a hot section of the hot water generator and consequently reduce the possibility of condensate forming.

    Turbulators featuring a new design able to increase heat exchange, without affecting pressure drop in the boiler.

    Front door with reversible opening(right and left) and innovative closing system with micrometric adjustment on the hot water generator front plate. Up to model 940 the door is insulated with double lining, made up of one layer of fibre and one layer of Carbowool, while higher output models use a double layer of refractory concrete and insulation.

    Threaded central heating flow outlet and return inlet connections up to model 401 and flanged PN10 for the remaining models.

    Supplied in 3 parts: steel body, casing and satellite controls (satellite to be ordered separately).



    CE mark in accordance with the following directives

    Gas Appliances (2009/142 EEC)

    Efficiency (92/42 EEC)

    Low Voltage (2014/35/EU)

    Electromagnetic Compatibility (2014/30/EU)



    Thermostatic control panel Thermostatic controller for single-stage or two-stage burners, with the possibility to control the system pump.

    THERMO EBM control panel Electronic for managing the hot water generator (including with modulating burners), with microprocessor control; logical control unit housed inside the casing and user interface with LCD on the front panel.

    Outside probe For boiler temperature compensation operation, to be connected to the THERMO EBM control panel.

    Cascade/outlet/storage cylinder probe Connected to the THERMO EBM control panel based on requirements.

    Industrial control panel For special needs regarding precision control or installation in safe environments.

    Control panel with PLC For specific communication needs to BMS or supervision systems.

    Pipe stub for instrument connection Able to house all the boiler control and safety instruments, available in different configurations.

    Stainless steel economiser to increase system efficiency by up to 5% (based on the system return temperature) by recovering heat from the flue gas.

    Economiser connection complete with return pipe extension, circulating pump with on-off valves and mechanical connection to the economiser performed directly at our facilities.

    Gas, oil or diesel burner

  • Technical Files
  • Manuals

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Forced draft & pressure jet floor standing boiler