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Frequently Asked Questions
So what does sealing it buy?
Mains pressure at every outlet.
Showers work without a pump.
Several taps run without starving.
And performance does not depend.
On where the bathroom sits.
What does removing the cistern give?
Loft space, and simplicity.
No tank to support or insulate.
No open stored water to maintain.
And it works the same in a flat.
Where a vented system cannot.
Why does sealing it change everything?
Because water expands as it heats.
With nowhere to go it becomes pressure.
So the system must absorb and relieve it.
It becomes a pressure vessel.
Rather than an open tank.
What safety devices does it carry?
An expansion vessel to absorb expansion.
A pressure relief valve.
A temperature and pressure relief valve.
And a discharge pipe to a visible place.
None of them optional.
Which fault comes up most often?
An expansion vessel losing its air charge.
Then expansion has nowhere to go.
And the relief valve starts weeping.
Which is the symptom people see.
Recharging the vessel is the fix.
Is installation restricted?
In most markets, yes.
It needs a specific competence.
And servicing is expected, not optional.
That is the real cost of unvented.
A maintained system, not a fitted one.
What if the mains supply is poor?
Then performance is poor.
There is no cistern to hide behind.
Pressure and flow both have to be adequate.
Measure the incoming supply first.
Not after the cylinder is in.