The UV Toastmaster Mark VII (also known simply as Toaster) is an ultra-violet based brand of toaster. It's particularly dangerous when set to seven or above. Presumably, there are six prior versions of the Toastmaster, and at least eight different settings for toasting.

Arthur Weasley had several and charmed them to become alive. In Harry Potter's first visit to the Burrow in 1992, the toastmaster attacked him with balls of fire, probably set to seven or above. When magically charmed alive, they are vulnerable to the Knockback Jinx, Vermillious and the Verdimillious Charm.