Are you on a pay monthly by direct debit? They usually try to average out consumption over 12 months too, so in the Summer you'll be paying more for actual usage and in the winter you pay less than actual usage. The difference is even more exaggerated since you have electric heating rather than gas.
Though I think you're questioning is 685kWh/month typical?
283 kW.h for the lighting
And lets say the remaining largest load is only the heater, we'll forget about the fridge and kettle etc.
685-283 = 402kW.h = 201 hours of water heater operation in 30 days = operating solidly for nearly 7 hours in every 24.
I'd say that's high, yeah
Nozzle
Though I think you're questioning is 685kWh/month typical?
283 kW.h for the lighting
And lets say the remaining largest load is only the heater, we'll forget about the fridge and kettle etc.
685-283 = 402kW.h = 201 hours of water heater operation in 30 days = operating solidly for nearly 7 hours in every 24.
I'd say that's high, yeah
Nozzle