If prices are equal for each heating source(in comparison with the efficiency of each source) and everything is equal(availability and stability of each heat source), I choose 1-electric heater, 2-gas heater, 3-oil heater.
As weather turns cold and the winter bites, it will be important to keep things warm inside. If your central heating doesn't quite cut it – or if you're in an area with no gas heating – then a portable electric heater (sometimes known as a space heater) is worth considering.
"Portable heaters are great for situations where heating has failed in your house," explains Rob Bennett, technical service manager at Pimlico Plumbers. "They are also great for camping and outdoors, when the cold hits.
If prices are equal for each heating source(in comparison with the efficiency of each source) and everything is equal(availability and stability of each heat source), I choose 1-electric heater, 2-gas heater, 3-oil heater.