Hydrogen boilers have received enormous press coverage as a potential gas replacement that would work with the existing gas grid. Here's an honest assessment of where the technology actually stands.
How hydrogen boilers work
Hydrogen boilers work similarly to natural gas boilers, burning hydrogen instead of methane. The combustion product is water vapour rather than CO₂ — making them zero direct emissions. Most major manufacturers (Worcester Bosch, Vaillant, Baxi, Ideal) have announced or demonstrated hydrogen-ready boiler models.
The current status
There is no domestic hydrogen gas supply available in the UK today. All current boilers run on natural gas (methane) or LPG. "Hydrogen-ready" boilers being sold now are essentially natural gas boilers that have been designed to convert to hydrogen relatively easily if the gas supply changes.
The grid question
The UK government's plan was to trial a hydrogen village to test 100% hydrogen supply. Significant technical and cost challenges remain. A full gas grid conversion to hydrogen is not expected before 2035 at the earliest, if it happens at all.
Should you wait for a hydrogen boiler?
No. A new A-rated gas boiler today will last 12–15 years. If the gas grid does convert to hydrogen in that time, your hydrogen-ready boiler may be convertible with a relatively minor upgrade. Installing a reliable modern boiler now is the rational choice — don't wait for technology that may not arrive.