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.

Each Dualstream system is supplied with a comprehensive illustrated manual, which takes you through the installation process.

To speed up installation time each Dualstream system has a factory fitted copper framework including the following components:
Combination valve (3.5 bar pre-set pressure reducing valve), line strainer, check valve and expansion vessel connection point. The framework includes expansion valve discharge to the tundish linked to the discharge pipe form the 1/2" temperature and pressure relief valve. The 3kw immersion heater is fitted (indirect models only) complete with regulation thermostat, dual pole thermal cut out, (2.3kw immersion heaters on direct models). ProTech anti corrosion systems o models up to 300 ltr. A two port motorised valve supplied to be installed on a 'S' plan system (indirect models only).

In addition all Dualstream systems are supplied with one 22mm double check valve and three 22mm full bore lever valves.