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Pumps use about 50w. Maybe 6h of use a day. 300wh a day, 9kwh in a month compared to not using central heating at all.
Running the oven for an hour a day 2kwh, 60kwh per month.
200wh per extra kettle boil, 6kwh extra per month.
As you used about 40kwh less in November, probably some combination of the above.
Acliff
Pump circulating the central heating?