I have just moved in to a new place with dimpex duo 4001 storage heaters and we don't no how to use the they have peek and off peek switches but how do we get the to work we are usein then at normal rates costin use a bom in money we have tried to set them to off peek and don't understand how to and have spent a few nights cold can u help me to understand and tell me how to work them PLEASE :/