Indirect Single Feed (self-Priming/Primatic) Cylinders
In the self-priming system (i.e primatic) both the heating circuit and storage water are fed from one source. There are various single feed methods on the market, one of which is shown below. An air lock within the cylinder, formed initially when the system is filled, prevents the heating circuit water from coming into contact with the stored heated water.
Airlock and Vent
Cold Feed (from cold water storage tank)
Vent Pipe(going to cold water storage tank)
To draw off points i.e hot taps
Primary Flow From Boiler
Primary Return To Boiler