2000W White Convector heater - Free C&C (More in OP)

At the energy price cap 29p this costs £0.58 for 1 hour. This wattage is similar to some ovens, hair dryers or large air fryers. For 12 hours (i.e a really cold day or you forget and leave it on it) costs nearly 7 quid. Yes the thermostat should cut the power when the room gets warmer but these are not very cost effective for any more than a few mins or boost. All the above is assuming its on the highest setting but if you use 750w it would be far more economical but its only going to be useful in small to smallish spaces not large living rooms in winter.The heat will also be a very dry heat overall. (edited)

It'll cost the same to run as ANY 2kw electric heater as electric heaters are virtually 100% efficient (ie electricity in is all converted to heat out). But electricity is around 3-4x the cost of similar energy from gas (albeit gas heating less efficient as some gets wasted up the flue). In most cases you'd be better off using the gas central heating unless you just want to heat one space for a short while. (edited)

I prefer oil filled radiators, as they stay warm after turning them off, and they’re almost silent.