ok , allow me to expand my details , it's a four bed with just two adults at the moment , so we have one kitchen , one utility , one downstairs bathroom with electric shower , one upstairs bathroom with hot supply from immersion tank shower , the on suite will be a electric shower , whilst I think understand what Harvest is saying , that if the shower is going and someone turns on a hot ? tap it wont be able to cope ? is that right Harvest ?