i currently have an open coal fire which heats just our sitting room and natural gas central heating for the rest of the house,just wondering can
i fit a back boiler to coal fire while still keeping gas heating too? and if so how do i go about it?
Your central heating system needs to be open vented. If it is, then it can be done (but still requires work). You have open vented if you have a small header tank in the attic.