A major part of the activities of the THyGA project was dedicated to testing typical residential and commercial natural gas appliances in order to have a better view of their behaviour when they are fed with H2NG mixtures. Blending rates of up to 60% H2 were applied. Although most of them performed well, some were subject to malfunctions with high percentage of H2 in H2NG mixtures [1].

One way to mitigate this problem is to ask manufacturers which of their appliances are compatible with H2NG mixtures and which are not and should be replaced. As a complement, for other appliances, the approach of a safety check has been tested by several projects. the THygA report D5.3 gives insight on safety check approaches, and recommendations for large scale implementation.