Unlike oil, gas, coal or wood, electricity does not emit CO2 when converted into heat. Its production method can be polluting, however.
It all depends on how the electricity is generated:
The output from gas-fired boilers, especially condensation boilers, is still better than from oil-fired boilers. They are normally far less polluting than electric heating unless you are using renewable electricity for your heating.
Lastly, if you are thinking about electric heating, it is far more cost-effective to invest in an electric heat pump than in electric radiators.
Heat pumps consume three times less and therefore pollute three times less for the same amount of heat produced.
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