The warning got here after 4 adverts were banned for misleadingly suggesting they may provide cheaper heating than gas.
InstaHeat, Keilini, Heater Pro and Heater Pro X said they offered a more economical choice to gas central heating and will rapidly warm a room. The regulator said the claims were “inaccurate”.
An advert for the Keilini heater, which generally sells for £50, said: “This recent variety of ceramic heater has incredible efficiency. Almost no energy is wasted. This shouldn’t be only good for the environment but additionally good to your wallet. It heats every area in your room in 60 seconds. No other comparable heating device is as efficient.”
Not one of the advertisers responded to queries from the Promoting Standards Authority.
The Energy Saving Trust said gas is currently cheaper than electricity and it’s more efficient to heat a room with one radiator than with a plug-in mini-heater.
The ASA watchdog said: “We’ve banned all these ads and we’ll be keeping an in depth eye on claims around how consumers can lower your expenses on their bills, especially heating. We’ll be taking compliance motion to make sure consumers are protected and that ads which don’t comply are removed.”