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Information About GAH Dualstream
To obtain the very best performance from your Dualstream system the accumulator must be sized correctly, as it is the driving force supplying hot and cold similtaneous demand to the building.
The accumulator will hold approximately half its total volume and we would recommend a recovery time of 15 minutes, this will depend on the flow rate from the main supply, which can vary.
When choosing your Dualstream, consider the following:
Mains flow rate and static pressure
House type and number of occupants
Typical daily water usage
Number of bathrooms/ensuite/showers
Other water usage hot or cold
The Dualstream utilises all the benefits of traditional unvented cylinders with standard controls; temperature/pressure relief valve, expansion relief valve and pressure reducing valve set at 3.5 bar.
The system also uses an accumulator vessel, this stores mains water at the main pressure in a special butyl diaphragm, and is the driving force to the hot/cold supplies. The accumulator as shown below can be installed in two ways, option 'A' or 'B'. Option 'A' requires an accessory pack containing pressure reducing valve, expansion vessel and bracket, available form GAH at additional cost and should be ordered with the system.
The water pressure is balanced by air pressure between the accumulator wall and diaphragm. When any tap or shower is turned on, the stored water from the accumulator will supplement water from the incoming main.
If the accumulator is sized correctly, it will allow any number of baths or showers to be used simultaneously, irrespective of the incoming main flow rate and will function even if the mains are turned off, regardless of the mains water pressure. Dualstream systems can be sited close together or remote from each other offering flexibility in installation. | 
