The ZBT 23420 SA has a better climate class than most comparable spec fridge-freezers that are older than two years. This fridge has a T climate class, whereas most fridges of this age and type have a ST climate class. In addition, this Zanussi fridge-freezer have a SN and N climate class.
A T climate class is actually the best climate class across all fridge-freezers of a comparable spec and age to the ZBT 23420 SA.
A ST climate class is the worst climate class across similar types of fridge-freezer.