Wood burner installation
You will need to open up your original fireplace opening, fit a hearth, register plate and usually a liner and of course a carbon monoxide alarm
Fitting the flexible liner
Now the liner installation can begin. If you are only in need of a liner fitting to make your existing installation legal then this the work to expect. Sometimes stoves can be fitted without fitting a stainless steel liner, but this the preferred method by HETAS and is deemed to be the safest and least likely to cause a chimney fire.