We got used to eat Pizza Hut in Indonesia. That's why we wanted to try again the pizza with cheese ring when we were in Heidelberg. We were 4, 2 adults and 2 Children (11 and 8 years old). Unfortunately, the pizzas were too big and too much for us. One pizza with salami (16€) and one pizza spicy Chili or whatever it's called (22€)! We drank sprite, orange juice and beer. In the end the bill was around 50€. I don't recommend it to any body who doesn't really starving, otherwise s/he needs to pack it home. I think this pizza Hut doesn't serve a pizza with cheese ring in a small size/protium is like in my home country.
PS: in the opposite, there is a Restaurant where chairs and tables under umbrellas are available for whom who may eat outside during sunny hot days.