More than 300 electrical heaters that have been seized at the port of Felixstowe.
Work by Suffolk Trading Standards' import surveillance team discovered the products posed a serious risk of electrocution.
Concerns were raised when the grills used on them did not require tools to open, meaning live and hazardous parts could be accessed by hand.
The supply voltage requirements stated on the heaters were also incompatible with the UK power network, reportedly posing a danger of explosion or electric shock.
The seizure came after snow fell in Suffolk on Tuesday and people are looking to alternatives to stay warm during the cost of living crisis.
Graham Crisp, head of Suffolk Trading Standards, said: “These unsafe heaters were due to be sold via Amazon but, thanks to the intervention of our Imports Surveillance team, the listing has now been removed, saving shoppers from unwittingly putting themselves at risk.
“We know that the cost of living is concerning for most, and many people may be more tempted than ever before to turn to products that seem to offer a good deal.
"Unfortunately, bargain purchases can leave you paying the ultimate price, with these increasing the risk of fire, serious injury or even death.
“Everyone can keep themselves safe by only shopping at reputable retailers and checking that anything they’ve bought meets safety standards.
"All electrical equipment should have a CE and/or UKCA mark.”
Andrew Reid, cabinet member for public health and public protection, added: “I am incredibly grateful to Suffolk Trading Standards for their continued work to protect consumers by intercepting harmful products at the port before these can enter the UK’s marketplace.
“Even legitimate heaters can pose a fire risk if not used sensibly, so I would urge all Suffolk residents to follow safety precautions when heating their homes during the colder temperatures forecast across the county over the next few days.
“Heaters shouldn’t be used for drying clothes and must always be kept away from curtains and furniture.
"In addition, heaters should never be plugged into an extension lead, which could easily overheat and go up in flames, potentially endangering both people and property.”
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