The Vaillant uniSTOR pure pre plumbed High Gain Cylinder has an expansion vessel external to the cylinder. The cylinder is supplied with the expansion vessel in a separate box.
The Vaillant high-quality, stainless-steel pre-plumbed uniSTOR cylinders are available in a wide range of capacities, from 150 to 300 litres with slim options suitable for Vaillant heat pump installations.
Designed with simplicity and ease of installation in mind, Vaillant's pre-plumbed models reduce installation time, while the brand-new purpose-designed buffer reduces product footprint and allows for more flexible siting.