Grouped Renewables Limited

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NEW MODELS for 2017

Patented Dynamic Pressure Relief
Single or Twin Pump units
Small Footprint


  • Expansion - no membrane vessel
  • Automatic pressure maintenance - reduced maintenance costs
  • System top up - equalise water loss
  • Pressure Step Degassing - protect the system from damage
  • Dirt removal - by settlement, additional filter option
  • System Dosing


HC8S nav

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No membrane pressure vessel.

The expansion is at  atmospheric pressure which not only minimises the expansion vessel size, but also allows the pressure step de-aeration process. 

No membrane in  the vessel means no gas pressure to maintain, no membrane to replace

Henry's Law

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Download Brochure here

Download Technical Information here

Free and dissolved gases or air bubbles, formed during system filling and  absorbed from parts of the heating system are removed using this unique  de-aeration device.

Opening a mineral water bottle produces gases which  were dissolved in the water, the Olymp Automat uses the very same  principal to remove from the installation all aggressive and destructive gases even from remote areas of the system.  See Henry's Law -   adiabatic gas separation.


Small System Pressurisation Units


System pressurisation and top up

HC7N - Single Pump
HC7ND - Twin Pump

Digital controller
Pump  4 Bar
Connection 1/2”
3 Volt free connections
Alarms - High pressure, low pressure, general fault

230 Volt
400 VAC (per pump)
Regular pump kick start for continuous operation
HC7ND auotmatic pump changeover  on each activation

25 litre  Nominal
Chemically inert to chemicals normally used in heating/cooling systems
Cold and heat resistant

560mm Long x 650mm high x 300mm deep
(HC7N empty) 22Kg
(HC7ND empty) 25Kg
Expansion Vessels

Expansion Vessels

Expansion Vessel
  • Various Expansion Vessels
  • Up to 5 year warranty
  • Gas charge to your specification available (certain models)
  • Potable
  • Non Potable
  • Domestic
  • Commercial
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