Altecnic 12 Litre Intermediate Vessel - SX-VI0012

The intermediate vessel hold a quantity of water which is allowed to cool and it is this cooled water which enters the expansion vessel.

  • £46.38


Eres intermediate vessels are manufactured to meet the requirements of PED 97/23/EC Directive, are suitable for closed solar energy heating systems in accordance with DIN4757-2 ‘Solar heating plants operating on organic media; Requirements relating to safe design and construction’ and BS EN 12977 & DD CEN/TS 12977

"Thermal solar systems and components. Custom built systems & performance test methods".

In the event that the diaphragm within an expansion vessel could be subjected to continuous temperatures above 100 ̊C, the vessel must be protected by an additional vessel (VDI 6002 directive).



The vessels are fabricated by welding the various sections together which results in a very reliable structure suitable for internal pressures up to 10 bar.

Intermediate vessels do not contain a diaphragm but act as a buffer vessel.

Epoxy coated and available in white.



The intermediate vessel should be installed between the solar collector and the expansion vessel.

The function of the vessel is to avoid premature ageing of the diaphragm in the expansion vessel caused by water contacting the diaphragm at too high a temperature.

The intermediate vessel hold a quantity of water which is allowed to cool and it is this cooled water which enters the expansion vessel.

Technical Data

  • Max. working pressure: 10 bar
  • Operating temperature range: -10 to 160 ̊C


  • Shell: carbon steel
  • Connections: carbon steel
  • Coating: epoxy powder
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We operate a NO QUIBBLE returns policy to give you peace of mind when buying. In the unlikely event that the product you order isn't quite what you wanted then get in touch, post it back & we will process your refund when it arrives back with us

Returning Direct items

If you would like the supplier to collect any items that are not needed, there would be a collection and re-handling charge of 25% per item and a charge of £45 + VAT (The £45 + VAT would be per collection, not per invoice or item.)


The handling charges would also increase depending on the date from delivery to collection, 25% is for anything collected within 1 month of delivery to site. Anything over 2 months would be more than the 25% and again for 3, 4, 5 months etc and you would be notified when contacting us.

Last update 13:10 18/08/2022

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