To make a quick personal calculation: how the savings are in the fuel is proportional to the meters of the house.
Marta lives outside of Valladolid with her three children, but some weekends and vacations come to a second residence of well-isolated 100m² on the outskirts of Valladolid. Each year consumes 8.000 kWh of energy for heating.
Marta did not want to work radiators or invest much in a heating but did not want to go cold. What it did was analyze what it cost the supply of electricity for heating in one year and the other fuels.
Luckily Marta has bought a channeled air pellet stove with which she can heat the whole house with the same stove. I used to have electric radiators and with the change, 1.322 € was saved in just one year. Now they love to watch how the pellets burn on the stove, how it heats them and the smell of firewood.
The stoves for gas cylinders are cheaper, but to get the same heat each year 288 euros would be spent more in cylinders than in pellets, in addition, he would have to buy several stoves, and the comfort would not have been the same for his family.