Well firstly, the combi will have a temperature control knob for the hot water. Depending what model of boiler it is, the hot water temperature may be displayed in a digital display. The control knob will have the logo of a tap next to it.
You cannot fit a shower pump to a combi or other pressurised system.
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!