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are often used where space is at a premium or for ease of installation, reducing the need for a separate cold water cistern. Where indirect systems are concerned, however, there is usually still a need for a header tank to feed and vent the primary circuit.
Using a template as opposite it is relatively easy to indicate the size and positions of your required connections. Heights of tappings are measured from the base of the cylinder to the center of the tapping, their position in the horizontal plane is usually indicated as a position on a clock face or alternatively the distance between tappings is shown.