This is a five pint copper kettle. I haven't tried heating it but cold it is certainly watertight despite the bash to the base.
5 pint copper kettle with brass handle frame - watertight
A 6 pint copper kettle William Soutter & Sons Soutterware English made
LARGE VICTORIAN 8 PINT COPPER KETTLE, BRITISH, c.1840s-60s
A Rare Oval EV Wilkes & Co, Victorian ** Five Pint ** Copper Kettle 3 of 4 LE
A Rare Extra Large Victorian Antique ** Ten Pint ** Copper Kettle C.1850 4 of 4