Cold water tank? dont have one....
All we have is a hot water tank in an airing cupboard in the main bedroom. Surely this cant be gravity fed?
Does the hot water 'tank' look like a conventional copper cylinder, or
is it a really sturdy looking affair?
If the latter, you may have an unvented hot cylinder with a direct feed
from the cold mains, and running at near mains pressure. If so, it will
have lots of pipes and other gubbins connected to it - which is why
someone asked for a photo in order to be able to identify it.
If it *is* an unvented cylinder, the hot flow will stop very shortly
after turning off the cold mains. Turn off the mains and open a hot tap.
If the water flows unabated for a long time, it ain't an unvented
cylinder. I would expect to get no more than a few litres of hot before
it reduces to a dribble and then stops. If this happens, you can safely
dismantle a tap to fix the leak - as long as you don't turn the mains on
again until the tap's back together!
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