Hello all. This is my 1st post and hopefully the 1st of lots, not just question, I intend to help as much as possible if I have any info of use (unlikely but you never know). Firstly I would like to thank Opal Fruit for his stunningly informative post about French plumbing, it answered so many of my questions I will certainly be buying you a drink if we ever meet. Top man. Secondly thanks to every one else for the forum, it's very informative, only problem is I am finding some answers to some questions but finding more questions I didn't know I had lol. I have spent 3 days reading and only scratched the surface. We are in the process of purchasing a 3 story town house in Aubeterre with the intention of renting rooms out for B&B to provide a small income to subsidise a lot of other small incomes. Hopefully we will be moving there early next year and initially want to install 2 en suites on the two bedrooms on the top floor. We already have what looks like a large chauffe-ballon on the ground floor, I have not had much of a look at it as I am still under the iron sky that omnipresent over North Wales/Cheshire, but it looks big. I have been toying with how we would be able to get water to the 3rd floor but after reading Mr Fruit's post it would seem to me that as hot water is at mains pressure it should be able to make it's own way up there (in pipes obviously) making the plumbing a lot easier. The plan is to create the two rental rooms using the existing hot water system and then if we want to create more rooms to rent possibly install another tank. Now this is the bit I need clarification on. Would a 200ltr tank be ok to run what may be 4-5 showers a day? If I were to install a second tank I would plan on having it on a separate switch so we would only use it when we had a house full. Would it be a good idea to have the 2nd tank in series with the 1st tank so it could be used to fill the main tank with cold water when not turned on and doubling the volume of hot water when needed by feeding it's hot contents into the tank that normally supplies water? This way I could use mostly the same plumbing and just insert another tank in the supply to the original one. Obviously it would need wiring in properly. Hope this makes sense. Look forward to hearing your thoughts on my brain wave. Ian