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Frequently Asked Questions
What is its classic role?
Feeding a vented hot water system.
The cistern supplies the cylinder.
And gives it its pressure by height.
Which is covered with the cylinders.
Under vented hot water cylinders.
What is the less obvious benefit?
It decouples the building from the main.
A burst, a shutdown, a low-pressure spell.
None of them stops the building.
And the main is drawn slowly.
Rather than in peaks.
Where does that matter most?
On a weak or shared supply.
Where simultaneous demand outruns the main.
The tank absorbs the peaks.
And refills between them.
It is often the real reason for storage.
Why does loft temperature matter in summer?
Because warm stored water grows things.
A loft in summer gets hot.
And water warming into that range.
Is worse than not storing at all.
Insulate against heat as well as frost.
Is a bigger tank always safer?
No, and oversizing has a cost.
Water sits longer before being used.
Turnover is what keeps it fresh.
A tank far larger than daily use.
Holds water for days.
Why are tanks sometimes coupled in pairs?
Because one large tank will not fit.
Through a loft hatch, usually.
Two smaller ones joined at the base.
Behave as a single volume.
And one can be isolated for cleaning.
What must the lid actually do?
Exclude insects and vermin.
Not merely cover the opening.
With screened vent and overflow.
An open or loose lid.
Is how a cistern gets contaminated.