Ministers discussing 2035 cut-off date after which installation of conventional gas boilers will be outlawed
It comes amid growing concern about the impact of domestic heating systems on the UK's carbon emissions
But alternative energy options are hugely expensive, with ground source heat pumps costing up to £19,000
Solar panels or water heating are £5,000 and biomass boilers at £5,000 to £19,000 depending on the type
Air source heat pumps come in at £11,000 while the cost of hydrogen boilers could be from £1,500 to £5,000