Can You Steam a Mattress for Bed Bugs? What It Reaches

Yes, steam can kill bed bugs on a mattress, but only where it touches them. It works well on the surface, in seams and in the bed frame joints. It does not reach deep inside the mattress or the divan base. Used with care, steam is a useful part of a plan, not a cure on its own.

What the research shows

A 2018 laboratory study in Pest Management Science tested two consumer steamers and one professional machine. All three killed 100% of bed bugs resting on an exposed mattress. They also killed 100% of bugs hiding in cracks. Mortality was above 89% for bugs under a fabric cover. Bugs behind a leather cover did not die in significant numbers, whatever the machine.

The lesson is about reach, not price. A cheap steamer matched the professional unit because the heat could touch the insect. However, where a barrier blocked the heat, every machine failed. So the question to ask is not how much the steamer cost, but whether the steam can reach the bug.

An earlier Texas A&M study found that steam killed 100% of eggs and 88 to 94% of nymphs and adults. The authors called it a practical part of integrated management. They also said it was likely an inefficient way to clear a mature infestation. That fits our page on steam treatment.

Where steam reaches on a bed

Steam suits the places you can see and touch. For example, it can treat the mattress surface, the piping and the seams. It can also treat bed frame joints, slats and the headboard, because the nozzle can sit right against them.

It struggles with anything thick or sealed. The inside of a mattress is dense, so a surface pass will not heat it through. A divan base is harder still. The European Code of Practice calls bugs inside divan beds notoriously difficult to treat, and it says the fabric on the underside may need to be removed to inspect them. It adds that bed base encasements can be of considerable value there, as we explain in our post on mattress encasements.

How to steam safely and effectively

The European Code of Practice gives clear technique points. First, keep the flow low, because a strong jet can blow bugs about. Second, hold the nozzle in direct contact with the surface, because the temperature drops quickly with distance. A gap of only a few centimetres will not be lethal. Third, avoid brush heads, since stiff bristles can flick off eggs and bugs.

Move slowly so the heat has time to soak in. Afterwards, vacuum up the dead bugs, which also helps you judge progress. Test a hidden patch of fabric first, because steam can damage heat-sensitive and water-sensitive materials.

Check the care label on the mattress too, and let it dry fully before you make the bed. Steam also adds moisture to the room. The Code warns that humidity can lead to mould unless you ventilate afterwards. Hot steam can scald too, so keep children and pets out of the room and wear sturdy gloves. Read the safety and labels guide before you start.

Why steam alone rarely clears an infestation

The Code says that unless infestation is low, steam cannot reliably control bed bugs alone. The British Pest Control Association agrees that steam generators suit only an integrated plan. Missed insects keep breeding, and steam leaves no residue to catch newcomers.

Even a weak dose has a limit. In a Rutgers study, a calibrated steam treatment killed about 28% of adults. The survivors were less active and fed less the next day. However, their mating, egg production and hatching rates were unaffected. A half-hearted pass can therefore leave a breeding population behind.

Moisture can also undo other products. Steam reduced the efficacy of every insecticide dust tested in a 2020 Rutgers trial. So do not steam over desiccant dust, and do not mix methods without checking the label. Our pages on insecticides and heat treatment show how professionals combine them.

Where steam fits in a plan

Steam works best as one step in a sequence. Start with a careful inspection, then steam the visible harbourages and encase what you can. Also bag and wash soft items first. Wash and dry bedding at high temperatures, as our post on washing and drying explains. Items that cannot take heat may suit freezing instead.

Then monitor. Interceptor traps under the bed legs can show whether bugs remain. If you travel, check luggage carefully, as our post on avoiding bed bugs after travel describes.

If you can still find live bugs after a few careful sessions, stop and call a professional. The NHS says it is very difficult to get rid of bed bugs yourself. Our DIY treatment guide and treatment comparison set out the limits.

Can you steam a mattress for bed bugs?