Reflex N_NG Vessel
Reflex N_NG Vessel

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N/NG Vessels

Reflex NG / N Vessels are the worlds most frequently used heating vessels.

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  • Description

    In a closed heating system water cannot be compressed so any increase in volume, created by an increase in temperature, has to be accommodated by an expansion vessel. When water is cold, the pre-charge pressure forces the diaphragm against the tank towards the inlet. As the temperature increases, the expanded water volume pushes against the diaphragm creating additional volume for the water to enter. When the temperature decreases, the pre-charge pressure forces the water from the tank and back into the main heating system. This maintains a constant pressure within the heating system helping to reduce energy consumption.

    REFLEX heating vessels are resistant to ethylene or propylene glycol mixtures, have low gas permeability and are all tested according to the Pressure Systems Directive

    In the smaller NG range, the two halves of the vessel and the diaphragm are retained by a crimped collar to give a pressure tight seal.

    In the larger N range the vessel is fabricated by welding the various sections together which results in a very reliable structure.

  • Applications

    The REFLEX N / NG Range can be used for the following applications:-

    • Sealed Heating Systems
    • Sealed Chilling Systems
  • Features
    • Maximum Working Pressure: 6 BAR
    • Maximum Working Temperature: 120C
    • Capacities from 8L up to 1000L
    • Factory Pre-charge: 1.5 BAR
    • 2 year Manufacturers Warranty
  • Materials
    • Shell: Carbon Steel
    • Connections: Carbon Steel
    • Diaphragm: Synthetic rubber compound
    • Coating: Powder Epoxy
  • Downloads

    Simply click on the filenames below to download:

    Datasheet – REFLEX N-NG-F
    O&M Manual – REFLEX Heating


Resistant to Ethylene & Propylene Glycol


Low Gas Permeability


Capacities from 8Ltr to 1000Ltr


Maximum Working Temperature: 120C


2year Manufacturers Warranty


Crimped Collar Gives Pressure Tight Seal