Unvented Hot Water

Platinum Plumbing / Unvented Hot Water

unvented cylinder

The high quality, stainless steel uniSTOR cylinder is a hot water storage facility, ideal for domestic properties with a new or existing sealed system or open vent boiler.

uniSTOR cylinders are ‘unvented’ cylinders which means they can operate efficiently under higher pressures, for example in a sealed heating system.

Available in a wide range of hot water storage capacities, the uniSTOR is suitable for almost all types of property with a sealed system or open vent boiler. Being suitable in particular for larger properties with multiple bathrooms, heating systems using a cylinder can often provide a higher level of hot water than a combination boiler.

Vaillant uniSTOR unvented cylinders can be used when converting from an open vented system (with a cold water tank in the loft) to a sealed system (boiler and cylinder system). Converting to a sealed system can help save space e.g. during loft conversions etc when there is no room for a tank, and in most cases will provide higher water pressure at your taps and shower.

By upgrading an old copper cylinder (with insulation jacket) to a new uniSTOR unvented cylinder (as part of a heating system upgrade), you can make your heating system more efficient by reducing your cylinder heat losses significantly, which in turn can help to reduce your fuel bills.

The uniSTOR range of cylinders is produced from high grade Duplex stainless steel for longevity, to give you complete peace of mind. This is further supported by a 2 year parts and labour guarantee, and a 25 year guarantee on the cylinder shell.

Features & Benefits

  • Made from high grade duplex stainless steel providing long term peace of mind.
  • Highly insulated with environmentally friendly materials, helping to make your heating system more efficient and save you money.
  • Aesthetically pleasing outer casing which can be easily cleaned.
  • Impressive 25 year guarantee on the cylinder shell.



Great service. He also quoted us for the job before he started. No hidden costs. Very polite and knew what he was doing.


Reliable guys, that are flexible on price, so I would definitely use again.

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