To a 100 % hydrogen domestic boiler

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Hydrogen combustion produces approximately 142 MJ per kg, but its physical density is very low, at room conditions approximately 81 g/m3. By comparison methane produces 50 MJ/kg with a density of 654 g/m3. Currently, there are existing hydrogen infrastructure projects in progress in Europe (GRHYD in France) to use a mix of methane and hydrogen due to the safety issues and avoiding boiler burner redesign. Hydrogen burns quite differently to methane, with a faster flame speed, and a transparent flame, such that it is harder to control and maintain the flame in steady combustion, and the radiative transfer is weaker than for the visible methane flame. These characteristics require redesign of domestic boiler burners if hydrogen is to be used as a network fuel. A BEIS report by Frazer Nash in April 2018 described how industry has the opportunity to redesign for suitable domestic hydrogen burners. Worgas Ltd are a local company investigating the practical application.