Fewer than 10,000 heat pumps have been installed in England and Wales during the first year of a programme giving households a £5,000 voucher to help cover the cost.
Families who have purchased homes with heat pumps already installed - or bought new builds where pumps were part of the package - say they have encountered a litany of problems.
How heat pumps leave some homes so cold owners are having them ripped out dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.