If you don't have access to a microwave, there are still several ways to warm up refrigerated or frozen pizzas. Here are a few methods you can try:
Oven: Preheat your oven to a temperature between 350°F (175°C) and 400°F (200°C). Place the pizza directly on the oven rack or on a baking sheet. Bake for about 10-15 minutes or until the cheese has melted and the crust is crispy. The exact baking time may vary depending on the thickness of the pizza and your oven, so keep an eye on it.
Toaster Oven: If you have a toaster oven, it can be an excellent alternative for heating up pizza. Preheat the toaster oven to around 350°F (175°C) and place the pizza directly on the rack or on a baking sheet. Heat for 10-15 minutes, or until the cheese is bubbly and the crust is crispy.
Skillet or Pan: Using a skillet or pan can help revive the crispness of the pizza crust. Place the pizza in a dry, non-stick skillet or pan over medium heat. Cover with a lid to help the cheese melt. Cook for a few minutes until the cheese has melted and the crust has become crispy. You can also add a few drops of water to the pan and cover it with a lid to create some steam, which can help warm up the toppings.
Grill: If you have access to a grill, you can use it to reheat your pizza. Preheat the grill to medium heat and place the pizza directly on the grates. Close the lid and cook for a few minutes until the cheese has melted and the crust is heated through. Keep a close eye on it to prevent burning.
Remember, the cooking times provided are just estimates, and you should monitor the pizza closely to achieve the desired level of warmth and crispness. Enjoy your pizza!