My DH is a truck driver and works evenings. He always takes a hot dinner.His food flask is an Aladdin wide top with a heat pad in the base. Heat it in the micrwave for 2 minutes and if he happens to be driving to Canberra re-heats in Sydney.
Dashingden is there no microwave for DW? Instead of buying expensive things that don' t told the heat how about buying a cheap microwave for her place of work if it is suitable. Gert