When we moved here, there were four chimneys. One was for a smaller Rayburn, the others for the front rooms, and the main bedroom.
The only ones ever having seen a fire were the Rayburn and one front room! They're now - er - plastered over...
They all suffered from an unusual problem of 'bending' from the heat, and to be honest, I'm so glad we had them taken down some years ago, as the big one was right over our bedroom!