I bought this Meaco Arete Due 25L product (at 443.80 euro) because I have a large house and on the manufacturer's website it refers to the 25L as the version for larger rooms. But then here on the product sheet I have now seen that there are the two 25L versions for 60 m2 and the 20L version for 100 m2 at 385 euro. I wonder at this point if there is an error on the product sheet or what, because it seems strange to me that the 25L version serves 60m2 at a higher price than the 20L version which serves 100m2. Who can support me in this? Thank you