We also live in BW. House KfW-55, approx. 165m2, currently 2 people working. Cook every evening and wife likes to bake. The house is rather warmer than usual in all rooms (luxury). Have an air-to-water heat pump with controlled residential ventilation and heat recovery. Household consumption approx. 175 kWh, heat pump total approx. 640 kWh. Costs thus without basic fee 45€+135€. Advance payment is a bit higher, you are happy about refunds after all.