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Ditto Aggi above. Got a cheap 1.8kWh from Argos (challenge?), small and discrete when not needed, hot enough when it is. Bit noisy, but about 1p/min to run. Keep my home office (1m cube) warm enough if needed to top up during the day.
I’ve found it’s very much an instant heat, but it doesn’t linger in the same way as turning on central heating so good for a top up, not great for constant use.
Parents have an electric oil filled radiator which is much better at the longer term warmth, but a fair bit bigger!
Is there a forum-approved, energy-efficient, plug-in heater for keeping one room toasty for a couple of hours without turning the central heating on?!