The casing is the outer casing of the heating unit. The casing will vary depending on the model you have. The various casing designs have changed substantially over the years as the suppliers strive to make them as user friendly as possible.
Fits a number of Viessman Appliances
Technical specification
TypeInsulationManufacturer Model No7827843Brand NameViessmann
Reviews
Viessmann 7827843 Rear Insulation Block (Td Only) From 27.07.2007