I can't comment on oil fired Agas but you are right than they don't sell them in France. The best bet would be to go to a local Aga supplier and chat to them about your needs. Aga France has a good website with all the local suppliers. Gas fired Agas are the cheapest to run, but if you are not on mains gas then bottled is expensive. The other option is an electric Aga. We bought an electric run Aga last year as we are not on mains gas and it has been brilliant for us in Brittany. I would not do without it. I think, from memory, that it can be converted in future to oil but I am not positive. Aga are very good at answering queries of this kind. On another note our Aga has been a magnet for all tradepeople coming through the house. The man who installed our woodburning stove couldn't keep his eyes off it and I had to show how it worked, was constructed etc,