British Gas, OVO, EON, Octopus, EDF customers warned over appliance 'adding £300 to energy bills'
Households could typically save £60-£70 a year just by switching off 'vampire devices', according to Energy Saving Trust.
British Gas, EDF, EON, Ovo, Octopus customers urged to use thermostat button for free £170
Stephen Day, a heating engineer at iHeat, has revealed the optimal thermostat setting for maintaining a warm home without ...