The revised approach removes the requirement that newly installed heating systems must run on at least 65 per cent renewable energy, reopening the door to oil- and gas-powered boilers. Ministers argue the change restores flexibility for homeowners, but environmental groups warn it represents a decisive retreat from climate leadership.

The original legislation, introduced in 2023 under a centre-left coalition, was designed to accelerate the shift away from fossil fuels in buildings – one of the country's largest sources of carbon emissions. Heat pumps were positioned as the central technology, supported by generous state subsidies.

Opposition to the policy grew rapidly as inflation rose and energy costs soared. Conservative politicians framed the law as an economic burden, while the far right portrayed it as state overreach into private homes. The backlash proved politically potent.

Under the new framework, households will once again be permitted to install gas and oil heating systems, including so-called hybrid models that blend fossil fuels with limited renewable inputs such as biogas or bio-oil. The government insists the revisions remain compatible with emissions-reduction targets, but experts question whether sufficient volumes of "green" fuels will ever be available at scale.

Senior figures from the Green Party say the compromise abandons the urgency demanded by the climate crisis. Katharina Dröge, co-leader of the party's parliamentary group, described the decision as a fundamental failure of responsibility, accusing the governing coalition of sidelining climate protection altogether.

Environmental organisations were even more blunt. The German Environmental Aid Association said the reform reflected the priorities of the fossil fuel industry rather than the public interest, warning that households could face rising costs as gas prices fluctuate and supply tightens.

Germany remains the European Union's largest greenhouse gas emitter, with nearly four-fifths of its homes still heated using oil or gas. Critics argue that easing the transition now risks higher long-term costs, both financially and environmentally.

Supporters of the change, led by the conservative Christian Democratic Union, say households need choice, not mandates. Economy minister Katherina Reiche said the revised rules would allow a mix of technologies while gradually increasing renewable shares.

Heat pumps, while cheaper to run over time, remain costly upfront. Government subsidies covering between 30 and 70 per cent of installation costs will continue until at least 2029, but critics say financial incentives alone cannot compensate for weakened regulation.

With Germany legally committed to reaching net zero emissions by 2045, campaigners warn that delays in decarbonising buildings could prove costly to reverse. As one Green politician put it, loosening the rules now risks trapping households in expensive fossil fuel systems just as the rest of Europe moves on.