Portable gas heater indoors
Updated: 21 October 2026
The listing says indoor, and you are about to light it in a flat, a bedroom, a tent, or a room you rent. A portable gas heater indoors is allowed only as a flueless heater in a ventilated room the manual permits, with someone awake and a window or vent to outside air. Assembly is on the [how to use a cabinet gas heater](/hub/portable-heaters/gas-heater/sub/gas-heater-how-to-use) page, and the table is the [gas heater comparison](/hub/portable-heaters/gas-heater). Products Compared read those listings and UK public sources on 19 October 2026, not in a lab. A qualifying purchase can earn a commission at no extra cost to you.
The listing says indoor, and you are about to light it in a flat, a bedroom, a tent, or a room you rent.
The listing says indoor, and you are about to light it in a flat, a bedroom, a tent, or a room you rent. A portable gas heater indoors is allowed only as a flueless heater in a ventilated room the manual permits, with someone awake and a window or vent to outside air. Assembly is on the how to use a cabinet gas heater page, and the table is the gas heater comparison. Products Compared read those listings and UK public sources on 19 October 2026, not in a lab. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Stated place of use | Oxygen depletion sensor | Fuel | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  NJ The right choice NJ-H2 4.2 kW cabinet | Indoor; room-type list includes a bedroom | Claimed | Butane | 8.7 | about £99.90 | View offer |
| Best value |  Straame Straame foldable 4.2 kW | Indoor, including conservatories, garages and workshops | Claimed | Butane | 8.4 | about £64.99 | View offer |
| Alternative |  Taylor & Brown Taylor & Brown 1.3 kW plus 4 cans | Outdoor on the attribute; bullets also say indoors, tent and caravan | not stated | Butane or propane claimed | 6.3 | about £29.99 | View offer |
On this page
What indoors is allowed to mean
Indoors, for a butane cabinet, means fresh air from outside for the whole time it is lit. Calor’s guidance is about a metre of clearance, no moving the heater while lit, and off before sleep. An oxygen depletion sensor, where a cabinet claims one, clicks the gas off if the air deteriorates. It does not make a sealed room acceptable. Under the Gas Safety (Installation and Use) Regulations 1998 a portable cylinder heater sits in regulations 3, 35 and 36. A Sealey cabinet manual for that model also excludes bathrooms, basements and high-rise flats unless your own manual allows them.
Bedrooms, tents, and caravans
From 31 October 1998, HSE has restricted open-flued gas space heaters in rooms used for sleep unless they are room-sealed or have an atmosphere-sensing device. Calor’s buyer’s guide excludes bedrooms, tents and other sleeping accommodation, sensor or not. Turn the heater off before anyone sleeps. Public Health Wales warns against a portable barbecue in a tent or a caravan, and a flueless heater has the same closed-space problem.
Where the listings in this set disagree with the manual
Reviewers of the Lizzie Jacobs 1.3 kW bundle say the manual is marked for outdoor use only, against a bedroom bullet. Follow that manual. The Taylor & Brown listing puts outdoor on the attribute and still mentions indoors, a tent and a caravan, without a shut-off. The NJ-H2 room-type field includes a bedroom. That field is not a bedroom approval.
Landlords, employers, and alarms
Fit a BS EN 50291 carbon monoxide alarm in any room where the heater runs. England’s 2022 landlord alarm duty is for a fixed combustion appliance other than a gas cooker, so a tenant’s own cylinder heater does not, by itself, trigger it. The alarm is not a reason to seal the window. If the landlord provides the heater, HSE says it needs an annual Gas Safe check. A blower in a closed site hut is a different case, on the cabinet or blower page.
If you feel unwell
NHS carbon monoxide symptoms include headache, dizziness, nausea, weakness, confusion and breathlessness. Go outside first, including children, and do not go back in to turn the heater down. From outside, use NHS 111. Use 999 if someone is unconscious, confused or struggling to breathe. Do not relight the heater to test the cause. Soot, a blue haze or a clicking oxygen depletion sensor is a stop for a Gas Safe engineer.
Common questions
Are portable gas heaters allowed indoors in the UK?
A butane cabinet can be used indoors only in a ventilated room that the manual allows, with fresh air from outside and the heater turned off before sleep. The Gas Safety (Installation and Use) Regulations 1998 cover a portable cylinder heater. They do not ban every lounge, and they do not bless every room a title names. Direct-fired blowers in this set are for outdoor or well-ventilated non-domestic space, not for a sealed flat. If your manual excludes the room, the listing does not overrule it.
Can I use one in a bedroom?
No. Calor’s guidance excludes bedrooms and other sleeping accommodation, and tells you to turn a mobile heater off before sleep. HSE’s rule from 31 October 1998 restricts open-flued gas space heaters in rooms used for sleep unless they are room-sealed or have an atmosphere-sensing device. A cabinet is not room-sealed. An oxygen depletion sensor does not turn a bedroom into an approved sleeping space. The NJ-H2’s room-type list includes a bedroom. That line is not permission.
Can I use one in a tent or a caravan?
Do not. A tent is a small closed space, and Public Health Wales already warns against a portable barbecue in a tent or caravan. A flueless heater has the same problem. Caravan and awning lines on these listings are incomplete. The Taylor & Brown bullets mention a tent. The other Straame asks about a caravan and does not answer. A Sealey cabinet manual excludes leisure vehicles for that model. Use an appliance that is actually approved for the vehicle, or do without.
Does the oxygen sensor mean I can shut the window?
No. The sensor is a last resort that should shut the gas off if the air gets poor. It is not a ventilation system. Calor still wants fresh air from outside and about a metre of clearance while the heater is lit. If the sensor clicks off, turn the gas off and air the room. Do not close the window so the room keeps the heat. The heat you keep that way is bundled with exhaust gases the sensor has already objected to.
Does the 2022 alarm law cover a portable heater?
England’s 2022 landlord alarm duty is for a fixed combustion appliance other than a gas cooker. A tenant’s own portable cylinder heater is not that trigger. Fit a BS EN 50291 carbon monoxide alarm anyway. The alarm warns you. It does not replace an open vent, and it does not make a bedroom acceptable.
What are the symptoms, and who do I call?
Headache, dizziness, nausea, weakness, confusion, and breathlessness are the NHS list for carbon monoxide poisoning. Get everyone outside first. Call NHS 111 from outside for advice. Call 999 if breathing is failing or someone is confused or unconscious. Do not go back for the heater, and do not relight it later to check. If the heater sooted or the flame looked wrong before anyone felt ill, leave it off and arrange a Gas Safe engineer.
Related pages
Sources
Public UK sources on gas safety, LPG and carbon monoxide. Listing prices, stars and review counts are from amazon.co.uk on 19 October 2026.
- Gas Safety (Installation and Use) Regulations 1998 (retrieved 19 October 2026)
- HSE — Safety in the installation and use of gas systems and appliances (L56) (retrieved 19 October 2026)
- HSE — Gas safety checks for landlords (retrieved 19 October 2026)
- HSE — Carbon monoxide on construction sites (retrieved 19 October 2026)
- NHS — Carbon monoxide poisoning (retrieved 19 October 2026)
- Liquid Gas UK — butane cabinets, BS EN 449 and hoses (retrieved 19 October 2026)
- Calor — The difference between butane and propane (retrieved 19 October 2026)
- Calor — Guidelines for the safe use of mobile heaters (retrieved 19 October 2026)