According to the following website: http://www.aic.org.uk/Storageheaters.htm
(the asbestos information centre) your storage heaters are listed in the column marked known to be asbestos free. Hope this comes as a relief!
Rob Wilkes
February 2008
I can answer this question...
Was there any asbestos in Dimplex XT18 economy 7 night storage heaters?