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Question About 2 CWS Tanks in Loft

Postby handoverfist » Sun May 26, 2019 3:43 pm

I have a question / seeking advice about my CWS tanks.

I have 2 CWS tanks in the loft both are connected at the bottom of the tanks.

The first tank has the CW supply regulated by a ball & stopcock, but no overflow pipe.

The second tank of the same size has the overflow pipe but no ball & stopcock.

My query is should the first tank have a overflow pipe as well? or is it regulated by the water pressure from the second tank, so if the stop cock fails in the first tank, will the water level rise as well in the 2nd tank and out through the overflow pipe? (should of paid more attention in physics class). TIA.
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