I've got a calor gas heater for just in case we get any power cuts.I've got one for emergencies. Even when we had gas once the electric went neither the hob nor the boiler would ignite with these modern safety requirements, no power and the gas shuts off.
As you say the central heating needs a power supply to work.
I can also toast my bread on it to.
With tha and a pint of beer its the living the life of luxury 🤣