New natural gas-only boilers are facing a ban within four years under net zero proposals for the grid to use hydrogen instead. All boilers installed after 2026 would have to be hydrogen-ready under the plan, which the Government announced in a consultation on Tuesday. – Telegraph

iHowz comment

All boilers are already capable of running on a blend of 20% hydrogen 80% natural gas – Hydrogen Boiler | Worcester Bosch 

Going to 100% hydrogen would be problematic, as the network would not be able to deal with the smaller molecules.  Other issues are that hydrogen is less energy dense than natural gas and it may result in NOX in the emissions, although this also applies to natural gas

See also  https://www.britishgas.co.uk/the-source/greener-living/hydrogen-boilers.html

It is expected that the switch to hydrogen will be phased with hydrogen gradually increasing as a percentage of a mix with natural gas.