As long as the oven isn’t shooting flames of fire about then they can indeed survive. However they can survive flames for a certain amount of time so as long as they’re not Holy Flames. Heat alone will not affect vampires to a certain point. Cryptozoologists have run experiments on evil vampires captured in the midst of committing unspeakable acts. In one heat experiment the vampire remained calm while lying in the laboratory oven since he was promised fresh blood for his trouble. As the oven approached 4000° Fahrenheit, close to the melting point of sand into glass, the vampire showed some discomfort, and actually started sweating. At 5000° the vampire got extremely angry, and demanded to be released as convulsions began. This lasted for thirty seconds until the temperature reached 5500°. The vampire then lost consciousness. The science oven temperature rose to the maximum of 25,000° with the vampire displaying no signs of actually being baked. He was not killed, and awoke from his slumber within eight minutes of being released from the oven. Upon awakening he ravaged the blood supply provided for him like a mad dog. He was none the worse for wear after being super heated.
The vampire in question claimed to be 478 years old, and had no idea how many generations removed from the first vampire who ever existed. Cryptozoologists estimated he was somewhere within the 18th, and 20th generation range based on living dead DNA testing. His demographic is representative of the average vampire. Vampire powers increase with age, and are greater in the earlier generations. Experiments with older vampires yielded a vampire who never complained about the heat at 25,000°. There is also anecdotal evidence of vampires surviving nuclear detonations at ground zero which can be millions of degrees. So we recommend to all vampire slayers to never rely on heat alone when looking to eradicate a nefarious Nosferatu.