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.
When supplied with a Vaillant Heat Pump from Spire, use of the uniSTOR unlocks the seven year parts and labour warranty for your heat pump unit.

For use with a heat pump, a larger cylinder is suggested compared to a fossil-fuelled boiler to allow for recharge time.

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) when there is no room for a tank, and, in most cases, will provide higher water pressure at your water outlets.

By upgrading an old copper cylinder with an 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.