This might be unhelpful as I have no figures. Our daughter had an extension completed last year. The builder advised her to have an electric radiator fitted instead of one through the existing oil heating system. Apparently, the newer electric radiators are more efficient than the older electric radiators. I should point out all our radiators are through the gas heating system.
Electric rad should be close to 100% efficient whereas with gas and oil there are losses at the boiler and in the pipework, but electricity is more expensive per unit.
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