Different energy sources are measured in different units: kWh, therms, BTU, cubic metres, litres and more. This makes it very difficult to compare the actual costs for powering a heating system between different energy sources. In order to make a fair comparison we need standardised units to...
nottenergy.com
Slightly confusing but some use
Wood etc all about the same as gas but potentially more waste.
Yes electricity massively more expensive.
As others have posted 1 kwh is 1 kwh.
Small electric heaters can be handy eg a bedroom/office for limited period of time.
Using the heat efficiently is key.
In small houses keeping the gas CH on a lot at low room temperature and low water temperature is a reasonable plan.
Then supplement some areas.
Any gas or kerosene standalones are simply dangerous.
We need to allow some air to circulate otherwise simply breathing can cause a build up of CO2