2 Adults, 2 kids, also close to 10 kWh per day (cooking on electricity (induction) but showering on natural gas, 0.6-0.8 m3/day). When we are not home, it's about 4 kWh per day (2 freezers, 1 fridge, home server, router etc). Big sources are Laundry, dishwasher, hot water in the kitchen (5L boiler).

But we heat the house on gas, and last december we burned about 180 m3 of it. Now, during summer, (in the Netherlands) we don't need heating or air-conditioning.

Not sure how you are managing this, are you sure your numbers are correct? When I turn my kettle on it consumes more then 2kW, yes it is running for a few minutes at a time but it all adds up, not to mention the electric oven.

With all major appliances off (except the fridge/freezer) I consume ~0,13 kW/h, that adds up to 3,36 kWh in 24 hours.