I would say it uses on average a litre every couple of months. There are no signs of any leaks anywhere within the engine bay or inside the cabin of the vehicle. Since changing the heater matrix I’ve had no issues
Presuming that litre is coolant! - A litre of coolant every couple of months is still not right though i'm afraid.
How much oil does it use?
I would monitor this - make a note of millage and qty of coolant added.
I would also check the coolant level every few days - to see if the level is slowly dropping - or has one large drop?