We had 2 installed 6 months ago, cost 35,000FF (3,500). We obtained numerous quotations and they hovered around 20,000FF each. My advice when it is being installed carry a spirit level with you as some French builders believe water runs uphill. Don't allow any backfill of trenches untill you have checked the installation of connections. We used a builer close to St Dizier les Domaines who turned out to be an utter rogue, will supply details by email if required.