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6.4 Tundish
The tundish supplied must be fitted so it is visible to the occupier, away from electrical equipment,
and must be connected with copper pipe (not plastic). Guidance on the Building Regulations
requirements for the discharge pipework is provided in Section 6.10.
6.5 Expansion Vessel
An expansion vessel is supplied as part of the unvented kit and must be connected to the pipework
between the inlet group and the cylinder in order to accommodate expansion of the stored water
due to heating. For ease of installation a dedicated expansion vessel port is provided on the body
of the inlet group itself.
Ensure the expansion vessel is mounted with the connection at the bottom and that access is left
available for future servicing and removal.
Expansion vessel connections must be piped in copper.
The Expansion vessel must be mounted securely enough to support the weight of the vessel
when full.
Where a secondary return circuit is used, increased expansion capacity may be required.
