Vaillant eco TEC plus 415 Instructions Manual page 15

General requirements 3
3.16 Open vented heating system
The boiler must be supplied from an unrestricted
water supply taken from a feed and expansion cistern
situated at a maximum height of 27 metres (90ft)
above the boiler.
The cold feed must be 15mm minimum size.
The vent must rise continuously and be unrestricted.
It is important that the relative positions of the pump,
cold feed and open vent are as shown in fig 3.9.
Fig. 3.9 Open vented system
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