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The interior of the fireplace is lined with vermiculite. Its role is identical to that of fireclay, only it is much lighter and therefore cheaper.
Parts of the firebox are damaged by the long-term demand of the radiator to deliver far higher temperatures than prescribed by the manufacturer, i.e. by excessive heating to heat a larger space than expected by the radiator.
If Vermiculite cracks, the oven is still functional and does not need to be replaced immediately. It is perfectly normal for partial cracking to occur due to high temperatures or carelessness when inserting wood. Vermiculite should be changed only when it is eliminated, that is when the fire comes into direct contact with the metal surface of the firebox.
If you’re heating with the recommended quality of fuel, and if the chimney is in function, then the combustion is of good quality, and the glass will not be polluted. If intervention is still required, the glass should be maintained with the usual glass cleaners.
Product connected to the chimney according to the technical instructions of the manufacturer.