The company announced on Thursday that the fast-food chain will take telephone orders from Thursday between 11 am and 10 pm, or 11 pm at the weekend.
“The desire for a delivery service among our customers is huge”, said Christian Bauer, European marketing director for Burger King.
Customers are expected to receive their deliveries within 40 minutes by car, scooter or electric bike, and can pay with cash or by debit card.
However, only eight out of 685 branches nationwide are currently taking part in the scheme, which was piloted at one restaurant in Mannheim at the end of January.
This second phase of testing allows customers within a radius of eight minutes' travel time to order from new branches in Berlin, Chemnitz, Gera, Zwickau, Dresden, Waiblingen and Singen.
The company had a tricky end to 2014 after a franchise operator, Yi-Ko, had to close its 89 branches after going into administration.
Yi-Ko had been hit by allegations of staff mistreatment and accusations of poor hygiene at the franchises it operated.
Its branches have since reopened under control of the administrators.