They are really not and for lots of really obvious reasons.I think hydrogen boilers are quite possibly going to be more widespread than heat pumps.
- There is not a surplus of clean hydrogen to power them with and we are decades away from decarbonising existing uses. Burning 'brown' hydrogen is worse than burning gas.
- Green hydrogen is more expensive than gas, a lot more expensive in fact, you typically need 4-6kwh of electricity to make 1kwh of hydrogen. You might as well just use an electric radiator...
- The entire gas infrastructure and every appliance attached to it would need to be replaced because its not designed to take hydrogen and it would leak out. Hydrogen is explosive in a far wider range of concentrations than gas, needless to say, that's bad.
Heat pumps are being installed today and need 1kwh of electricity to add 3-5kwh of heat to a property.
Hydrogen might get widespread adoption as an LPG replacement for bottled gas but that's about it.
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