Question: what are most efficient electric heaters?
Answer: De'Longhi HCX9124E panel convector heater. ...  Dimplex DXUC2B ceramic fan heater. ...  Duronic HV101 radiant convector heater. ...  VonHaus 7 Fin 1.5kW oil-filled radiator. ...  Simple Value 2kW upright fan heater. ...  Dimplex Cadiz Eco 2kW electric oil-free radiator. ...  Dyson AM09 Hot + Cool fan heater.