Thank you all for the advice, I too am concerned a little about the weight. The good news is it is a very well built victorian house.(I hope :blush5::blush5🙂 I have now positioned 22mm thick sterling osb board over the joists, of course, but also over and in the middle of a brick wall above a doorway from the landing to a bedroom. The board is slightly larger than the external dimensions of the two tanks & the boards will be screwed to the joists.
Each shower has a max flow rate of 18 litres per minute. There are currently only 2 people living in the property but it is being prepared for sale & when finished it will have 6 bedrooms, therefore more people potentially. I have read on here about how to pipe it up to avoid stagnation & have no worries about that but I don't fully understand about the incoming flow rate....the pipe work is 15mm (copper) & the incoming rate seems pretty slow from the float valve into the existing cistern. Sorry if this is a stupid question but you suggested increasing the size of the float valve or maybe fitting 2....will that increase the flow rate into the cistern without increasing the size of the pipework?...& if so would it increase it enough to get away with just 1 tank?
