It doesn't give the quick blast of heat that a fan heater does but they seemed much less efficient.
Any direct electric resistive heater will be 100% efficient. Fan heaters slightly less so, as they need to drive fans as well as the element.
A fan heater will heat up the air much quicker, but will be doing fuck all very quickly once turned off.
An oil radiator will have a load of thermal mass acting as a buffer, and will continue to release heat energy long after the element turns off.
Both will impart the exact same amount of heat energy into a space, for an equivalent amount of energy consumption, only the way you experience this energy as a human over time may vary.
Fair point, but the 2kw fan heater probably overshot the temperature rather than the slow increase from the 700w so more cost-effective may be a better phrasing.
Any direct electric resistive heater will be 100% efficient. Fan heaters slightly less so, as they need to drive fans as well as the element.
A fan heater will heat up the air much quicker, but will be doing fuck all very quickly once turned off.
An oil radiator will have a load of thermal mass acting as a buffer, and will continue to release heat energy long after the element turns off.
Both will impart the exact same amount of heat energy into a space, for an equivalent amount of energy consumption, only the way you experience this energy as a human over time may vary.