It doesn't really matter how many rooms you have - combi boilers come in different sizes for larger houses etc. The main concern would be the hot water demand, if you have more than one bathroom, where it's likely you may want to use 2 taps or a mixer shower and run a bath at the same time - then a combi wont be suitable.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!