We have an old gas fire and back boiler. If we want to remove the back boiler and change the fire does the liner have to be removed from the chimney or can it be used for the new fire?

flue liners have a life span of 15 years!there is not a problem removing the fire and b.b.unit.the flue is the one and only problem,if it is passing anywhere you could go to sleep and never wake up!!!having just done my gas regs yet again this year,there was 5 questions on boilers,35 on gas fires!needs to be done rite.take care.tom clydebank plumbing&heating

These works will need to be carried out by a gas safe engineer, he will advise on the condition of the flue. If you are changing to solid fuel, or wood stove, then the flue is different and would need to be changed, this would be done by a Hetas registered installer.