Stuart Turner RGFL4000 - Manual (Page 7)

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2 LOCATION - COLD WATER INSTALLATION
2.28 The cold water supply: The supply must be AIR FREE and have a
DEDICATED CONNECTION to the tank which should be via a tank connector,
positioned at a slightly lower level (25 mm minimum) than the feed pipe to the hot
water cylinder.
Do not connect to the mains.
Fig. 4
Outlet head must be
below bottom of cold
water tank and able
to pass a minimum of
1 l/min of gravity flow
Static inlet pressure 14
metres max
1
metre min