Use a bulb with the watts on your warmer’s label, and the same base and shape as the old one. Scentsy lists the watts on each of its warmers and sells 10, 15, 20 and 25 watt bulbs to match.
The watts on the label
Scentsy warmers melt the wax with the heat of a low-watt bulb or a heating element. Scentsy’s 2013 FAQ sheet says each warmer lists its bulb wattage on the silver label at its base, and that a higher-wattage bulb voids the warranty.
Scentsy’s product pages give a warmer’s watts as well, such as 25 W for its Harry Potter warmer. Its bulbs are sold by watts, each for the Scentsy warmers that call for that number.
Other warmers
For another brand, read the watts on the warmer’s label or in its instructions. Feit Electric’s wax warmer bulbs, a 15 watt and a 20 watt, both have the small E12 candelabra base.
Feit Electric’s wax warmer bulbs, from its product pages
Bulb
Shape
Base
Watts
BP15C71/2
C7, 7/8" across
E12
15
BP20G121/2
G12-1/2 globe, about 1-9/16" across
E12
20
Both are incandescent and sold in 2-packs.
Feit says the E12 base of its 15 watt bulb fits most standard candle wax warmers. The two shapes differ in width, so match the old bulb’s shape to be sure the new one fits under the dish.
Unplug the warmer and let the bulb and the dish cool before you change the bulb.
It depends on the base: Scentsy makes its wall plug bases for mini warmers in a 10 W and a 15 W version. Read the watts on the one you have.
Can I use an LED bulb in a wax warmer?
Scentsy's warmers melt the wax with a low-watt bulb's heat or with a heating element, and Feit's warmer bulbs are incandescent. Match the watts on the label.
The label and the bulbs for Scentsy’s warmers come from Scentsy’s own product pages and FAQs, Feit Electric’s warmer bulbs from its product pages, and the widths from the bulb makers’ size guides. Checked against published data from Feit Electric, GE Lighting, Westinghouse and Scentsy.
See all 5 sources
GE Lighting, “A Guide to Light Bulb Sizes, Types, Shapes, and Codes” (2022)
Feit Electric, “Decoding Bulb Shapes and Sizes” (2017)
Westinghouse Lighting, “Bulb Size” guide, and lamp catalog: shape sizes in eighths of an inch
Scentsy, warmer bulb pages (10, 15, 20 and 25 W), a warmer's and the mini warmer bases' product pages, its FAQ (read in a browser) and the Scentsy Fragrance FAQs sheet (2013): the bulb wattage on the silver label
Feit Electric product pages: wax warmer and salt lamp bulbs (BP15C71/2, 15 W C7 E12; BP20G121/2, 20 W G12-1/2 E12; BP40T8N, 40 W T8 E17)
General guidance from manufacturer and standards data. Products vary, so check the label and the maker's instructions.