I have to join in here as well. We have also decided on a cistern, but we still don't know if we will connect it to the house. (only for the toilet flush - I also have my doubts about the washing machine). We now have a price for the garden water connection and toilet flush with a large pump (without cistern - that is already included) for about 3000 EUR. Is this price justified or financially sensible? Ecologically, certainly. What experiences have you had?