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No best answer has yet been selected by daisydaisy. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Dimplex storage heater are usually 'hard wired' to a seperate supply that switches itself on at "off peak" times. That reduces extra load on the power suppliers and is set at a lower rate.
Check that you have 2 fuseboxes. If so, one should be marked "storage heating". Or you could plug in a lamp to the heater socket. If it will come on at 5:30, on a weekday evening.. It's not the correct circuit for a storage heater.
A simple solution (if it's plugged into an ordinary ring main) would be to buy a plug in timer and manually set times for it to come on. But you'll be paying your normal (higher) rate for the power.