Boiler covers are usually left uninsulated or inadequate insulation is applied by the boiler manufacturers. In these cases, boiler cover jackets provide the perfect solution. In order to prevent heat loss from the boiler covers, the required dimensions are taken with the right insulation material and fabrics, and the boiler covers are covered with insulation jackets, suitable for the desired surface, so that there is no open part. By keeping the surface temperatures at the desired levels, personal protection is provided in terms of occupational health and safety and a serious energy saving is achieved.