The costs of water consumption and boiler / geyser are included in the service costs, so you already pay this with your rent. The heating costs are also included in your service costs.
You will have to find a supplier yourself for electricity.
Do you cook on gas? Then you will also have to find a supplier yourself.
Tip: ask your housemates! There is probably already a contract through one of your housemates
The settlement of the service costs usually takes place before July 1 of the relevant year.
For more information on service charges, click on the link below.