I know storage heaters inside out as I was a designer of them from 1974. They are very simple but you need to be a competent electrician and conversant with them to be SAFE. So find yourself an electrician or someone who knows . There is a co in Clitheroe Lancs  - Capri Electrical Developments Ltd  tel 01 200 425070 who know heaters and supply all parts for all manufacturers. They have an internet site with illustrated parts lists.
                 g taylor
                
 October 2007