Thanks for this very good advice. It is our plumber who will be installing the stove, he was recommended as being 'very good', but I think he will err on the side of caution, which is good rather than go and try to experiment with something like this. I was going to get a double sided stove for the kitchen area and sitting room, but if the electricity goes I dont want to be left frozen as we cant use it as it has a electricity dependent pump, so we might just go with two separate stoves. there is only one stove that I can find that is double sided and has a back boiler so I will print out the brochure and see if it is a double pass or single pass.