The UK government’s push for British households to replace their gas boilers with low-carbon heat pumps would cost taxpayers £115 billion ($150 billion), a new study has warned. The government’s three-year Boiler Upgrade Scheme came into force on April 1, which pays households £5,000 ($6,509) towards the roughly £18,000 ($23,400) bill of purchasing and installing a heat pump. The government has allocated £450 million ($586 million) to the scheme, which will cover around 90,000 households. But environmental activists have called for the scheme to be extended. If it is extended to cover all 23 million homes currently using a gas boiler, the scheme could cost £115 billion, according to a new study conducted by the TaxPayers’ Alliance (TPA), a UK pressure group campaigning for a low-tax society. The TPA called on the government to “come clean on the cost of green measures” at a time when the tax burden is …