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Cylinder Types continued

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.


Expansion Volume

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

Primatic Cylinder

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