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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.
Explore the range
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.
Slim line, pre plumbed and standard cylinders in the range
2 year guarantee on parts and labour plus 25 year guarantee for the cylinder shell, giving you total peace of mind.
Can be retrofitted onto older systems meaning you can upgrade your cylinder without the hassle of the entire system.
Improved insulation meaning heat loss is minimised and lower running costs
Adjustable feet meaning the cylinder can be installed on uneven ground.