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I am soon to replace my corroded hot water cylinder (open-vented system) & would have to disconnect the primary HW circuit.
On leaving the tank, the return pipe joins a bypass & then the return from the radiators, all on the same floor. Do I have to drain all my radiators to prevent backflow when I disconnect the cylinder? There is no gate valve to close here.
On leaving the tank, the return pipe joins a bypass & then the return from the radiators, all on the same floor. Do I have to drain all my radiators to prevent backflow when I disconnect the cylinder? There is no gate valve to close here.