> However there are limits on how much can be added (5% of the mix usually) I think exploitation of this avenue very much depends on increasing or removing tha

> However there are limits on how much can be added (5% of the mix usually) I think exploitation of this avenue very much depends on increasing or removing that limit, for example: https://hydeploy.co.uk/about/news/hydeploy-and-the-road-to-100-hydrogen/ https://hydeploy.co.uk/about/news/hydeploy-and-the-road-to-1... https://www.theengineer.co.uk/hydeploy-keele-hydrogen-co2/ https://www.theengineer.co.uk/hydeploy-keele-hydrogen-co2/ There's a fun fact in there, although specific to the UK (possibly the whole EU): > Furthermore, any appliance produced after 1993 which is required to conform to the gas appliances directive has already been tested on 23% Hydrogen