| Δ0 | the tabletop fondue pot with fuel burner itself | tabletop fondue pot with fuel burner |
| Δ1 | other tabletop devices that use an open fuel flame | tabletop butane stoves, chafing dish fuel burners, tableside flambe burners, open-flame raclette grills |
| Δ2 | other tabletop dining appliances without an open flame | electric raclette grills, electric hot pot cookers, tabletop electric griddles, buffet food warmers |
| Δ3 | other kitchen cooking appliances | gas stovetops, toaster ovens, electric kettles, microwave ovens |
| Δ4 | other common household electrical or mechanical appliances | vacuum cleaners, hair dryers, washing machines, ceiling fans |
| Δ5 | ordinary household objects unrelated to appliances or heat | wooden bookshelves, cotton bath towels, ceramic flower pots, paperback novels |