you might also want to "calibrate" your temperature sensor :p
The month is over, today there will be another heating cycle added, so for January I am at 858 kWh for hot water, heating, and household electricity. That is 140 kWh more than in December, but the heating only ran for 2/3 of the month then. Without heating, it was around 480-500 kWh. But the electric car was always nicely supplied with photovoltaic electricity.