Does Steam Kill Bed Bugs? What Actually Works

Short answer: yes, steam kills bed bugs and their eggs on contact. That is genuinely useful, because eggs are the stage that survives most insecticide treatments. But “steam kills bed bugs” and “steaming your bedroom will get rid of bed bugs” are two very different statements, and the gap between them is where most DIY attempts fail.

Bed bugs die from heat, at every life stage. Adults, nymphs and eggs all have a temperature above which their proteins denature and they cannot survive. Steam carries a lot of heat energy, so when it makes direct contact with a bug or an egg, it kills it almost instantly.

That gives steam two real advantages over insecticide:

• It kills eggs. Most professional sprays do not reliably kill bed bug eggs, which is the single biggest reason chemical treatments fail and infestations “come back” a fortnight later.
• It leaves nothing behind. No residue, no smell, nothing for children, pets or people with asthma or chemical sensitivity to react to.

Everything above is true and still does not mean a steam cleaner from a supermarket will solve your problem. Four things go wrong:

1. The heat is gone before it arrives

What matters is the temperature at the fabric, not the number printed on the machine. Steam cools extremely quickly across even a short gap of air. A unit that produces very hot steam at the boiler can easily be delivering something closer to warm damp at the mattress seam — which is uncomfortable for a bed bug and survivable.

2. It is moved too fast

Transferring enough heat to kill takes contact time. Most people steam at roughly the speed they would vacuum. Done properly it is far slower than feels natural — a matter of centimetres at a time along a seam.

3. It only works where it touches

This is the fundamental limit. Steam has no residual action whatsoever. It kills what it reaches at the moment it reaches it, and does nothing at all for the population living inside the bed frame joints, behind the skirting, under the carpet edge, in the headboard fixings and in the wall voids. Those are usually the majority.

4. It can make things worse. High nozzle pressure blows bed bugs off the surface rather than killing them, pushing them deeper into harbourages and along into adjoining rooms. A partial steam treatment that disperses an infestation across three rooms instead of one is a worse outcome than doing nothing.

You pair it with something that keeps working after the steam has gone. That is exactly how our steam and desiccant dust treatment is built, and it runs in two stages:

1. Professional steam first, worked slowly across the places bed bugs actually live — wall and floor junctions, skirting, carpet edges, bed frame joints, headboards, mattress and divan seams, and upholstery. This kills the bugs and eggs present on those surfaces immediately.
2. Desiccant dust into the voids afterwards. The dust goes where steam cannot: inside the frame, behind the skirting, into the cracks. It does not rely on contact at the moment of treatment — it keeps working for months as bugs move through it and as any surviving eggs hatch.

Between them, the two stages cover both halves of the problem: what is on the surface now, and what is hidden and yet to hatch. That treatment starts at £300 for the first room, with a reduced rate for each additional room.

When is this the right choice? When heat treatment is not possible or not wanted — sprinkler systems that cannot be isolated, heat-sensitive contents, residents who cannot leave for the day, or a household that wants no insecticide used at all. If heat is possible, heat treatment remains the option we recommend, because it clears everything in a single visit and is the only method we guarantee.

Fair enough — here is how to do the least damage:

• Use the widest brush head you have and keep pressure low, so you are not blasting bugs off the surface.
• Move at roughly 2–3 cm per second. Much slower than feels sensible.
• Work seams, piping, tufts and frame joints rather than open fabric — that is where they are.
• Do not soak anything. Damp mattresses grow their own problems.
• Do the whole room in one session, and expect to repeat it. Steaming half a room simply relocates the population.
• Do not steam electrical fittings or into sockets.

And be realistic about the outcome: if you have had bites for more than a couple of weeks, the infestation is very unlikely to be confined to the surfaces you can reach with a steamer.

Does steam kill bed bugs?

Yes — steam kills bed bugs and their eggs on contact, provided the steam is hot enough at the surface it touches and is applied slowly enough to transfer that heat. The problem is not whether steam works in principle; it is whether a domestic steam cleaner delivers those conditions where the bugs actually are.

Does steam kill bed bug eggs?

Yes, on contact. Eggs are the stage that survives most insecticide sprays, so a method that kills them is genuinely valuable. But eggs are cemented into cracks and seams, so steam only kills the ones it physically reaches — which is why steaming alone rarely clears an established infestation.

What temperature does steam need to be to kill bed bugs?

What matters is the temperature at the surface, not the temperature at the machine. Steam leaves the nozzle far hotter than it arrives, and it cools very quickly across even a few centimetres of air. A machine advertising a high boiler temperature can still be delivering far too little heat at the mattress seam.

Will a domestic steam cleaner get rid of bed bugs?

Usually not on its own. Domestic units tend to deliver too little sustained heat, are moved too fast, and cannot reach into the voids and frame joints where most of the population lives. They also blow bugs deeper into harbourages if the nozzle pressure is too high.

Is steam better than spray for bed bugs?

Steam has one clear advantage: it kills eggs, and it leaves no insecticide residue in the home. Its disadvantage is that it only works where it touches. In practice steam is best paired with a desiccant dust that keeps working in the voids afterwards, which is how we deliver it.

Can steaming make a bed bug problem worse?

It can. Steaming with too much pressure, or steaming a room and stopping, tends to drive bed bugs deeper into wall voids and along into adjoining rooms. Partial treatment that disperses an infestation is a genuinely worse outcome than not treating at all.