Vaillant uniSTOR is a new range of six high grade stainless steel unvented cylinders. Finished with a stylish casing they are available in a range of sizes from 125 litres to 310 litres. uniSTOR can be used with proprietary system boilers. However when installed with Vaillant boilers such as ecoTEC plus system boilers, a total heating and hot water solution is provided. uniSTOR features a high recovery heating coil and insulation which exceeds CHeSS Best Practice. All seams are laser welded and the shell is backed up by a 25 year warranty.