Burner cover insulation device for a boiler and method for manufacturing such a device

An insulation device for shielding a cover plate of a burner housing from heat produced by a boiler burner inside the burner housing, wherein the cover plate seals an access opening provided in the burner housing and the boiler burner protrudes inside the burner housing, the insulation device forming a unit that is separate from the cover plate and comprising:

• a cover layer comprising a flexible layer of heat resistant inorganic fibers and having a first outer peripheral edge;
• a support layer providing mechanical strength to the device and having a second outer peripheral edge that at least extends to the outer peripheral edge of the cover layer, and
• a filling material forming an insulating layer between the cover layer and the support layer;
• wherein a through hole extends through the cover layer and the support layer thereby forming a first inner peripheral edge of the cover layer and a second inner peripheral edge of the support layer, wherein the through hole is at least delimited by the first inner peripheral edge of the cover layer, and wherein the cover layer and the support layer are connected along at least part of the first outer peripheral edge of the cover layer and at least part of the second inner peripheral edge of the support layer.