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 Unvented cylinders, now installed in most new homes, provide mains pressure hot water to taps, baths & showers .
These are very different from conventional hot water cylinders which are not pressurised and must be fed from a cold
water tank. In most homes this large tank is stored in the roof space.
Unvented cylinders take their water
directly from the cold water mains and so do away with the need for a
tank in the roof. Although they are large they do save space overall. Unvented cylinders require
careful maintenance because they are under high pressures. Unvented tanks must usually be approved by the building standards team at
your local authority.
Unvented Cylinders FAQs
What are the advantages of an unvented cyclinder?
There are a number of advantages with using an unvented hot water cylinder;
The water pressure is much higher which is great for showers & there is no need for a booster pump
You receive a more balanced water pressure at the hot and cold taps/faucets
There is a more balanced shower pressure which allows for safer temperature control
There are better high pressure terminal fittings such as taps/faucets & valves
There is no need for a cold water storage cistern/tank making loft conversions easier
Unvented cylinders are quicker to install than open vented cylinders and their associated fittings
What are the disadvantages of an unvented cylinder?
The disadvantages with unvented cylinders are:
Should there be low mains water pressure & poor flow rate, the system may be unable to operate
There is no water storage in the event of a water mains failure
The extra controls may potentially occupy more space (unless using a composite/combination valve)
Unvented cylinders are usually more expensive than open vented cylinders
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Unvented Cylinders