De Dietrich 97550721 rear part insulation

This is a rear part insulation panel for De Dietrich boilers, listed under the boiler insulation category. Insulation pieces of this type are fitted to the boiler casing — typically at the back or around the combustion chamber — to reduce heat loss, protect external components from excessive temperature, and maintain stable combustion conditions. They are part of the boiler’s body structure and are selected strictly by appliance model and mounting position, not by a technical performance rating. Combustion chamber insulation degrades over time due to repeated heat cycling. When replacing a panel of this kind, the original geometry must be matched exactly; a poor fit can create hot spots that damage the casing or reduce thermal efficiency. The part is identified by manufacturer codes 97550721 and 336.778.009 (catalogue article 336.778.009). Confirm the boiler model and the exact location of the insulation before ordering.