I'm planning a new extension of approx 30m2 which will consist of a shower room, utility room and family room. I currently have a worcester bosch boiler (not sure of model) will this be able to cope with adding new 3 new rads and a shower. The shower room will be approx 3m2 with a small rad and shower. The utility approx 8m2, one rad and the family room approx 19m2 so a large rad or couple of smaller ones. any help appreciated?