Frequently asked questions

A small block of scented wax with no wick. You put it in a warmer, which holds it at a temperature well below where anything would burn, and the fragrance evaporates into the room. Nothing is on fire and the wax itself is not consumed - only the fragrance leaves it.

For fire risk, yes. An electric warmer has no open flame, no wick and burns nothing, and the NFPA advises against candles in bedrooms and anywhere people may fall asleep. The exception is a tealight burner, which is a candle with a dish on top and carries the same risk as any candle.

It depends on which oils are in the wax, and it has to be checked rather than assumed. Pet Poison Helpline explains that cats lack a liver enzyme needed to metabolize certain essential oils and names wintergreen, sweet birch, citrus, pine, ylang ylang, peppermint, cinnamon, pennyroyal, clove, eucalyptus and tea tree. We do not label any product safe for cats - that is a veterinary judgment.

One in a plug-in or mini warmer, two in a standard warmer, up to three in a large one. Dose by how full the dish looks rather than by cube count, because cube sizes vary by nearly a factor of two and a half between brands.

Yes, and it makes things worse. A warmer delivers roughly fixed heat, so more wax means the same heat spread across a larger mass and a cooler pool - and fragrance release depends on pool temperature. An overfilled dish can produce a weaker room smell from more product.

Roughly 8 to 12 hours of running time per standard cube where anyone publishes a figure. Yankee states up to 8 hours per cube; Happy Wax states about 30 hours of scent time per ounce of wax. Most brands publish nothing at all.

You cannot tell by looking - spent wax keeps melting and looks identical to fresh wax, because only the fragrance is consumed. Use time instead: if you have run a dose for the maker's stated hours, change it.

Most often your nose has adapted - a constant smell drops out of perception within about ten minutes, so the room smells fine to a visitor and of nothing to you. The second most likely cause is spent wax. Leave the room for ten minutes and walk back in to tell them apart.

Not in the sense of spoiling. Wax does not go rancid and does not become unsafe with age. The fragrance oil slowly evaporates out of the solid wax, so an old melt is a weaker melt rather than a bad one. Storage matters far more than calendar age.

Cool, sealed, dark and flat. Heat and air exposure are what drive fragrance loss, so a low drawer or closed cupboard beats a windowsill, a radiator or the top of the fridge. Keep different scents in separate sealed containers, because wax picks up neighboring fragrance over time.

Between about $3.72 and $9.31 a year for the warmers we index, running six hours a day at 17 cents per kilowatt-hour - both of which are assumptions you can substitute. The formula is watts divided by 1000, times hours per day, times 365, times your rate.

Manufacturers do not advise leaving one running unattended, and there is no benefit anyway: the wax stops giving off meaningful fragrance within hours while your nose stopped registering it after ten minutes. If you want it running as you fall asleep, use a model with a published auto shut-off.

Not in the way people usually mean. They draw 15 W to 25 W - about a phone charger - and have no flame. The risk that exists is about siting: a warm object projecting several inches from a socket, behind furniture or out of sight, running for hours.

There is no single answer, because warmer bulbs are not standardized. You need the base type and the maximum wattage the warmer is rated for, both usually printed on a label under the base. Match the base first - the right wattage with the wrong base will not fit.

In a bulb-heated warmer, no. The heat from the bulb is what melts the wax, and an LED is efficient precisely because it produces very little heat. You get a well-lit warmer that melts nothing. If low running cost is the goal, buy a low-wattage plate warmer instead.

How far and how strongly a fragrance carries from a wax melt into the air around it. It is not a measured specification - there is no standard test and no maker publishes a fragrance load - so it describes an experience rather than a number.

Cold throw is the scent from unmelted wax, such as sniffing a sealed pack. Hot throw is what comes off a melted pool. They differ because fragrance components evaporate at different temperatures, so a strong cold throw does not reliably predict a strong hot one.

Better at different things. Soy melts at a lower temperature, so it suits gentle bulb warmers and gives a longer, flatter throw. Paraffin needs more heat, gives a faster stronger opening, and is cheaper. Neither is burned in a warmer, so the soot arguments from the candle version of this debate do not apply.

For fragrance, generally yes and often better - a warmer heats the whole dish rather than just the pool around a wick, and no fragrance is lost to a flame. What you give up is the flame light, which for many people is the actual point of a candle.

No, and we say so on every page. We own none of these products, were sent none of them and run no lab. What we do instead is compile the published specifications with the source and date beside every number, compute running costs from rated wattage with the assumptions labeled, and check every safety claim against a named authority.

Affiliate commission, and nothing else. If you buy through a link here we earn a percentage at no extra cost to you. We sell no wax, run no ads, accept no samples and take no sponsorship. Commission is not a ranking factor - several products sit lower than they might because their maker publishes no specifications.