In addition, a high recovery heating coil and superb reheat times being best in class make uniSTOR the only choice in unvented cylinders. And what's more, the uniSTOR range is fully compatible both with Vaillant system boilers (high efficiency ecoTEC and standard efficiency thermoCOMPACT boilers) as well as any other manufacturers' boilers - so whatever the system you can always add an extra touch of Vaillant performance.