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Frequently Asked Questions
Why store hot water at all?
Breaking the link between heat and draw.
Heat goes in slowly over hours.
And comes out fast over minutes.
A shower outpaces most heat sources.
Storage is what bridges that.
Why does storage matter more now?
Because heat sources became slower.
A heat pump cannot supply a tap directly.
Nor can solar, nor an off-peak tariff.
All produce heat slowly or at fixed times.
So all three need somewhere to put it.
What separates one cylinder from another?
Two independent questions.
Where the pressure comes from.
And how the heat gets in.
Vented or unvented, direct or indirect.
Any combination of the two exists.
What does the pressure question decide?
How the outlets perform.
And what safety equipment is required.
A cistern above gives pressure by height.
The mains gives it directly.
The difference is felt at every shower.
And the heating question?
What is allowed to heat it.
Direct means an element in the water.
Indirect means a coil carrying a circuit.
Only indirect can take a boiler.
Or a heat pump, or solar.
Why does insulation matter so much?
Because the loss is continuous.
A cylinder stands full for hours or days.
Losing heat the whole time.
It never appears as an event.
Just as a bill, every day.
Is a calorifier a different thing?
The same object, in commercial language.
Usually indirect and usually larger.
Often serving a building rather than a home.
The principles are identical.
Only the scale and the terminology differ.