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It’s a Horstman electric 7. It’s electric tank heating in the house

Hello team , I have got Horstman tank boiler in my new house and I don’t understand how it works. I tried to set off peak timings I.e 11pm to 6 am. We got hot water for some days but then I got bill of £699 so I thought I kept it for long hours so I changed setting to 1hr (6am to 7am) but I...