As An alternative, the government will stimulate people to switch their boilers with greener alternatives, namely warmth pumps and biomass boilers. The total funding pool readily available for the ECO4 scheme is £4 billion, and the amount of funding for individuals will differ determined by a number of components (see https://governmentinsulationscheme.water.blog/2025/08/22/energy-grants-uk-free-eco-grants-for-sustainable-living/