Stoves that can sit on a 12mm hearth

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Why are many stoves allowed to sit on just 12 millimetre of hearth? Because they DO NOT heat the surface underneath them to more than one hundred degrees Celsius. If a stove does NOT have this status it must have 125mm (5") of non-combustible material underneath it. Many stoves (especially 8kW or under) do have this status nowadays. https://www.stovefitterswarehouse.co.uk/pages/hearth-regulations