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Type AHEB4, AHEB6 and AHEB9 glass coil-type boiler is normally mounted in external circulatory loops using a spherical vessel as the main still. It should not be installed in the bottom of a flask or column.
The other types of glass coil-type boiler detailed on this page is again mounted in circulatory loops but as it’s nominal bore is same at the top and bottom, this unit can under certain circumstances, be installed one above the other to achieve multiples of the basic heat transfer area.
The maximum pressure in the coils is 3.0 bar g. The maximum differential pressure across the coils is 3.0 bars. Please refer to the performance data for glass coil-type.
Glass Boiler
The maximum permissible steam pressure at the coil inlets of boilers is 3.0 bar g, which is equivalent to a temperature of about 143oC with saturated steam. Higher temperatures can be achieved by using heat transfer fluids.
The heat transferred in most sizes can be considered on average as 250 Kcal/hr – m2 0c with a steam pressure in the coils of 3.0 bar g, although this figure declines marginally at lower pressure.


  • Flexible hoses must be used on the coil inlet and outlet and must have sufficient fall to avoid the collection of condensate.
  • To avoid the possibility of steam hammer, the steam main should be adequately trapped.
  • To clear the line of the very heavy condensate flow produced on start-up, by-pass valves must be installed around the trap on the coil outlet.
  • Control valves and pressure gauges should be positioned near to the heat exchanger.
  • Coil type boilers should not be fitted at the bottom of flasks or columns. They are designed to be mounted on an external circulatory loop, This ensures a rapid unidirectional flow across the heating surfaces, which improves the heat transfer performance and promotes smooth operation.
  • The steam pressure should always be adequate enough to ensure effective and smooth condensate removal. This pressure will vary according to the conditions of use and size of heat exchanger. For example, with the AHEB 12/12, a minimum pressure of 2 bar g will probably be required.
  • On start-up, the steam should be admitted positively and progressively to the coil battery to remove the condensate as it is formed and with the by-pass valve left open until a uniform flow of condensate is being vented.
  • Depending upon the overall operating conditions, the use of boilers under high vacuum is not always recommended.

HTA(m2) DN DN1 DN2 L L1 L2 *FCSA SHELL (cm2) Jacket Cap. Ltr. Type CAT.REF.
0.15 100 25 25 375 125 100 40 2 A AHEB 4
0.15 100 25 - 400 125 100 40 3 B AHEB 4/4
0.35 150 40 25 450 150 100 50 5 A AHEB 6
0.35 150 25 - 500 150 100 50 7 B AHEB 6/6
1.00 225 40 25 700 180 100 150 16 A AHEB 9
1.00 225 25 - 700 180 100 180 20 B AHEB9/9
1.30 300 25 25 700 215 125 330 40 B AHEB12/12