Free Boiler Replacement in the UK: heatzen.co.uk If you're a homeowner in the UK, you may be eligible for a free boiler replacement. The government has introduced a number of schemes to help people replace their old, inefficient boilers with new, energy-efficient models. Who is eligible for a free boiler replacement? You may be eligible for a free boiler replacement if you meet the following criteria: You are a homeowner in the UK. You are on a low income or receiving benefits.