WMDA Clearance and Connection Requirements
Connection Size Notes
Mains
Water Feed
½” BSP M An isolation valve must be installed on the
mains water feed for servicing.
Break Tank
Overflow
22mm Guidance on drainage requirements should
be obtained from the local water authority.
System
Connection
½” BSP M / 15mm The pressurisation unit andexpansion vessel
should be connected to the system at the
same point.
The point of connection should be in the
system return, on the suction side of the
circulation pump.
Non-return valves, pressure reducing valves
and RPZ valves must not be used.
flowpress WMDA Pressurisation Units
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