Companies such as Fry Technologies UK ­ 'Fernox' (tel: 0870 601 5000) and Betz Dearborn Ltd ­ 'Sentinel' (tel: 0151 420 9563) manufacture central heating corrosion inhibitors which they have tested and found to be suitable for all materials within the Equator product range.

There is currently no British Standard for corrosion inhibitors and reputable manufacturers conduct their own tests to verify that the chemicals will not adversely affect pipework materials.