Berlin (dpa) - Who heats with natural gas, will probably have to pay this year. Approximately 735 euros are expected to be due on average for residents of a 70 square meter comparative apartment, as the non-profit consulting company co2online announced. That would be 35 euros more than last year. Who heats with oil, will therefore have to pay this year with 854 euros as much as in 2018. For district heating, the company expects again with an increase of about 50 € to 910 € in the current year.