Europeans are at risk of cold showers after materials critical to hot water tanks were not included on an EU list of authorised substances, which was revised as part of the bloc’s sprawling environmental legislation.

Applia, the home appliance lobby group, has estimated that more than 90 per cent of hot water storage tanks would no longer be marketable in the EU if hafnium, a highly heat resistant metal, and its sister element zirconium are not recognised as safe for household use.

The two elements were not listed in the bloc’s rules for drinking water, which enter into force in 2027 and aim to protect consumers and improve water quality standards. The European Commission appears to have overlooked the fact that hot water tanks also hold potable water, with manufacturers warning they risk fines if they do not comply with the list of authorised substances.