Plumbing question anyone ?

[Straight Shooter]

if your system is a balanced flue (gas) it will turn off hot & cold if gravity fed tank look in the airing cupboard there is normally a gate valve for the hot water (wheel type) normally close that turn on basin and bath taps (to drain the pipes) and your away son...... you can do it live if you sas trained turn on all hot water taps on but only try if you are a mean mother f..ker like my wifey