ATAG iSteel Unvented Cylinders

The ATAG iSteel Unvented Cylinder range is designed to deliver reliable, efficient hot water performance. Whether you’re upgrading your current system or starting from scratch, the iSteel range offers flexible storage capacities and trusted performance.

With capacities ranging from 90 to 300 litres, there’s an iSteel cylinder to suit homes of all sizes. Smaller properties may only need compact models, while larger households with higher hot water demand can benefit from the larger storage options. This flexibility makes it easier to design a heating and hot water system that meets your needs without compromise.

All ATAG iSteel cylinders come with a ‘B’ energy rating, ensuring they meet high efficiency standards. Their construction supports rapid heat-up recovery, so you spend less time waiting for hot water and more time enjoying consistent performance throughout the home. The iSteel range is fully compliant with Part L of the Building Regulations, helping to support improved energy performance and reduced emissions across your heating system.

Built using stainless steel, every cylinder in the range is made to last. The inner vessel carries a 25-year warranty, offering long-term peace of mind. All other components are protected by a 2-year warranty, covering essential parts that ensure reliable day-to-day operation.

When installed as part of an ATAG heating system by an ATAG Selected Partner, iSteel cylinders offer a compact, dependable solution. They’re an excellent choice for modern homes looking to improve hot water delivery without compromising on quality.

To find out which iSteel model suits your property, get in touch with your local ATAG installer.