In an earlier contribution to this discussion,
BigWallop wrote:


So a new and dedicated pipe from the cold tank would continue to
supply cold water, even with the cold tank empty? Oh right.

You're not listening!

With a power shower going full tilt, you will potentially be removing water
from the cold tank faster than the mains supply can replenish it. So the
level will drop. When the level drops below a take-off point, that take-off
point obviously won't supply any more water.

The take-off point for the cold feed to the hot cylinder - which in turn
pushes hot water out of the cylinder to the shower pump - needs to be
*higher* up the cold tank than the take-off point for the cold feed to the
shower pump. Then, when the level drops, it will cause the hot feed to the
shower to stop first, with the cold feed still running. If it were the other
way round, you could have scaldingly hot water coming out of the shower.

I hope that makes it clear!
--
Cheers,
Set Square
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