Firebricks or stove liners found inside logburners are made from vermiculite and can last up to 5 years if treated correctly. They protect the body of the appliance from damage caused by the heat of the stove and act as a insulator thus keeping the stove burning at higher temperatures with less fuel, which is referred to as fuel efficency.

Cracks are very common as the heating and cooling of the bricks stresses the material and users aren't always gentle when loading logs into the firebox.

 They do not usually need replacing straight away. Wait until the brick is crumbly, the surface is flaking off or you can fit a £1 sideways into the crack (over 2mm). 

Using a stove with damaged firebricks or no firebricks can lead to warping of the stove and burning more fuel.

 You can usually purchase new firebricks from the manufacturer of the stoves website or we can visit to bespoke cut one or a whole set for you. 

Please note that they are NOT covered by the manufacturers warranty as the damage is caused by the user.