Having recently moved in I i'd like to fit a power shower or pump to my current system. I was told that the house has a combi boiler but from other posts on here i'm questioning that, as it has both a cold tank in the roof and hot tank in the airing cupboard. Also, as i have a pump to fit, is it feasible to install it directly to the bath hot and cold feeds as that also feeds the shower (via mixer selector) and would allow the bath to be filled faster as well as boosting the shower?