Specification Material: low carbon steel Finish: Anthracite Certification Powder coated finish to exceed 200 hours of neutral acid salt spray testing. Tested to BS & EN442 Complies with ISO9001:2008 regulations. Compatible for use on all UK heating systems (tank fed or combi systems). Combining high-quality heating products with excellent customer service, Home Galaxy is committed to ensuring the range of exceptional home and garden products at the best possible prices, with quick and professional service at the heart of everything we do.