| Run the  first part of the hot water distribution pipe work in 22mm. This can be reduced  to 15mm and 10mm as appropriate for the type of tap etc. Your aim should be to  reduce the volume of the hot draw-off pipe work to a practical minimum so that  the time taken for the hot water is as quick as possible. Do not use monobloc  mixer tap or showers if the balanced cold connection is not provided. Outlets  of this type can back pressurize the unit and result in discharge. Select a  suitable position for the expansion vessel. Mount it to the wall using the  bracket provided and connect to the inlet control set with the flexible hose  provided. Ensure that the top of the vessel is accessible for servicing. 
 Balanced  Cold Connection:
 
 If there are  to be showers, bidets or monobloc taps in the installation then a balanced cold  supply is necessary. There is a 22mm balanced connection on the inlet control  set.
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