I'm sure I was shown how to switch my gas boiler to heat water only (as opposed to radiators and water) but as I never needed to do that (I also have an electric shower) I failed to retain the information. However now I find I do need to heat just the water and a google search has failed to enlighten me. Can somebody please tell me how to heat just the water and not the radiators? I have a vague recollection that involved turning a lever one way for summer and then back for winter. I may be completely wrong. Would appreciate some help, thank-you AAM peeps.