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I have three Berry Magicoal storage heaters?

I have three Berry Magicoal storage heaters. Once switched on at the socket, they will warm up day or night. Is this correct? I thought that they only operated when the cheap tariff electricity was available?
Adrian, June 2011
They need to be on the timed circuit, Not just plugged in, Do you have dual tarrif for them? you cannot just plug them in.

SD, June 2011