These are prices I have just paid. They are a mix of Leroy Merlin and local Tout Faire depot. I should also point out that you can do cheaper too. We went for Stainless steel for the flue, for instance, and chrome TRVs...and plumbers get a trade discount of course. This is not a combi, we have electric Chauffe-Eaus. A "combi" version will cost you about 800 - 1000 EUR more. Note that they are not actually combis as such. There is a small (90-120L normally) ballon (tank) within the boiler case. The boiler automatically keeps this hot as you use water. The ballon only takes about 20 minutes to fully reheat. In practice, you never run out of hot water. The good thing about these is the hot water is at mains pressure, without any restriction that a combi would impose on the flow rate. Superb showers. Oil combis all work this way. An oil boiler relies on a massive cast iron (fonte) heat exchanger and a burner that requires some 10-20 seconds to fire up. You would be rather cheesed off waiting for 10 minutes for hot water!!!