The best wireless smoke alarms, compared.
Top pick: TEFLERON TSS913A 2-pack Best value: X-Sense HS21 – Two optical smoke alarms and one heat alarm at £47.99 on Link+ radio, if you buy carbon monoxide separately. Updated October 2026.
A wireless smoke alarm on amazon.co.uk is either a radio-interlinked set, so one trigger sounds the other heads, or a Wi-Fi unit that notifies a phone. Scotland expects every home to have ceiling-mounted interlinked smoke alarms in the living room and halls, plus a kitchen heat alarm. You may fit a sealed long-life battery kit yourself. England’s landlord rules ask for one smoke alarm on each living storey and do not require interlink. The 2.4 GHz app alarm does not make the rest of the house sound. Scottish guidance says the alarms do not need. An app alert is only for when you are away. A UK review describes a 9 V battery and no link to other alarms, so a landing alarm does not sound with it. How to choose is set out in the [wireless smoke alarm buying guide](/hub/fire-protection/wireless-smoke-alarm/sub/wireless-smoke-alarm-buying-guide).
A wireless smoke alarm on amazon.co.uk is either a radio-interlinked set, so one trigger sounds the other heads, or a Wi-Fi unit that notifies a phone.
42 products checked · 61 hrs invested · +18,600 readers
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Personal buying guide
Question 1 of 2
What should happen when one alarm triggers?
The TEFLERON TSS913A at £12.74 is a pair of standalone photoelectric alarms, and amazon.co.uk shows 4.6 from 1,228 reviews, the highest star rating in this comparison. The title is a 10-year sensor life with a 5-year replaceable battery, not a sealed cell, and the listing does not describe radio interlink. Bullets claim EN 14604, 85 dB and a silence button. UK reviews often call the test tone loud, which is what you want in a hall and less welcome if you press test at night. Each head is about 10 cm across and the pair weighs about 310 g. You can change the cell, which the sealed kits will not allow, though one alarm will not wake the other floor. The numeric score is high because of stars and price. It is the wrong box if the job is a radio-linked house.
Pros
Cons
Best for: You want two cheap standalone optical alarms and you are happy to replace the batteries around year five.
Less suitable: You need one trigger to sound every floor, or you want a sealed cell you cannot remove.
Specifications
Common questions
Are these two alarms interlinked?
The listing does not describe radio interlink. Treat them as two standalone heads.
Is the battery sealed for ten years?
No. The title is a 10-year sensor life with a 5-year replaceable battery.
Is it loud?
The bullets claim 85 dB plus a red LED. UK reviews often call the test tone loud.
The LINKD kit at £99.99 is a pre-linked radio set of three optical smoke alarms, one heat alarm and one carbon monoxide alarm, and amazon.co.uk shows 4.5 from 813 reviews. If one head triggers, the listing says the other linked LINKD units sound, and you can add more of the same family up to 30. The 10-year lithium cell is sealed, so a chirp is not a battery swap: UK reviews include chirps at about four years that you cannot fix with a new cell. Hush is claimed from any head, and the page offers pads or screws. The bullets claim BS EN 14604, BS 5446-2 and EN 50291-1, and the CO alarm carries a Kitemark claim plus a five-year warranty line. It is the top pick in this set when you want smoke, heat and CO in one box. A failed sealed cell still means replacing the head, and UK phone support is only a listing claim.
Pros
Cons
Best for: You want one pre-linked box with smoke, heat and CO, and you can replace a head if the sealed cell fails early.
Less suitable: You only need one smoke alarm on a single storey, or you want a battery you can change yourself.
Specifications
Common questions
Is this kit radio-interlinked?
The listing describes a wireless mesh. If one alarm is triggered, all linked LINKD units sound. Extra LINKD alarms can join, up to 30.
Can you change the battery?
No. The listing fits a built-in tamper-proof 10-year lithium cell. UK reviews include chirps at about four years that you cannot fix with a new cell.
What is in the box?
The bullets list three smoke alarms, one heat alarm and one carbon monoxide alarm, pre-linked.
The WISUALARM SA20A at £18.69 is two standalone photoelectric alarms with sealed 10-year cells, and amazon.co.uk shows 4.5 from 365 reviews. The listing claims EN 14604, a TÜV line, 85 dB and a silence button, and it does not describe radio interlink. Some UK reviews used the tape on a smooth ceiling. One unit fell after about a week, so those buyers treat screws as the mount that stays up. One review used a broom handle on the centre button. A TV-remote hush is claimed, and that remote is not in the box. It is a tidy sealed pair when two rooms need their own alarm and you do not need them to call each other. Adhesive is the complaint that recurs, and an alarm on the floor is not an alarm on the ceiling.
Pros
Cons
Best for: You want two sealed standalone alarms and you will screw them to the ceiling.
Less suitable: You need interlink, or you planned to rely on the sticker alone.
Specifications
Common questions
Do the two heads radio-link to each other?
The listing does not describe RF interlink. Treat them as two standalone 10-year optical alarms.
Will the sticker hold?
Some UK reviews used the tape on a smooth ceiling. One unit fell after about a week. Screws are the safer mount in those reviews.
Can you hush it from the floor?
One UK review used a broom handle on the centre button. A TV remote hush is claimed; that remote is not included.
The XUK PA-437EN at £21.99 is a 2.4 GHz Wi-Fi smoke alarm for Tuya and Smart Life, and amazon.co.uk shows 4.5 from only 13 reviews. A UK review describes a 9 V battery and no link to other alarms, so a trigger can ping the phone and sound this head without sounding a landing alarm. Pairing failed on 5 GHz until the phone was moved to 2.4 GHz. One review says the app has no test function; there is a physical test and silent button. The listing claims 85 dB and does not name BS EN 14604. The same model is also listed at £49.99 with no review line, so this is the price to compare. Thirteen reviews is a thin file for a safety device. Wi-Fi here is a phone notice, not the radio interlink a Scottish buyer page describes.
Pros
Cons
Best for: You already have sounding alarms and you want one extra head that messages your phone on 2.4 GHz Wi-Fi.
Less suitable: This would be your only alarm, or you need every head in the house to sound together.
Specifications
Common questions
Does Wi-Fi replace radio interlink?
Not on this listing. It joins 2.4 GHz Tuya/Smart Life for phone notices. There is no RF interlink stated.
Will it pair on 5 GHz Wi-Fi?
Reviews say you must put the phone on 2.4 GHz. 5 GHz pairing failed until they switched.
Can you test it from the app?
One UK review says there is no test function on the app. There is a physical test/silent button.
The XINDUM bundle at £96.99 is three smoke alarms, one heat alarm, one carbon monoxide alarm and one remote, sold as pre-linked, with 4.4 from 811 amazon.co.uk reviews. The listing states 85 dB and a 10-minute hush from the centre button. It claims EN 14604 and EN 50291; a heat-alarm standard is not named. Reviews say the green setup LED is faint and the CO screen can look opaque, while the sounder and the red alarm LED still worked on test for those buyers. Pads or screws are both offered, and the 10-year cell is sealed. It sits close to the LINKD kit on price and contents, with a remote in the box. The missing heat-standard line is the gap if you are checking a Scottish buyer page against the card.
Pros
Cons
Best for: You want a 3+1+1 radio kit with a remote and a large review file, and you can accept a card that does not name a heat standard.
Less suitable: You need the heat standard printed on the listing, or you only need a single standalone alarm.
Specifications
Common questions
What is in the XINDUM bundle?
Three smoke alarms, one heat alarm, one carbon monoxide alarm and one remote, described as pre-linked.
How long does hush last?
The bullets say pressing the centre button silences the alarm for 10 minutes.
Is pairing easy to see?
Reviews say the green setup LED is faint and the CO screen can look opaque. The sounder and red alarm LED still worked on test for those buyers.
The CPVAN second-generation 4-pack at £79.99 includes one remote for mute, test and pair, and amazon.co.uk shows 4.4 from 583 reviews shared with the larger CPVAN listing. The bundle is sold as smoke, heat and CO; this comparison counts two smoke alarms, one heat alarm and one CO alarm, while the product card does not print that split. It will not talk to an older CPVAN SM11R set. You can mount with magnets or screws, and the claimed standards are BS EN 14604, BS 5446-2 and EN 50291-1. At this price it is the cheapest complete kit in the capture, though the shared review pool is not a separate test of the 4-pack. The cell is sealed for 10 years, so an early fault is a replacement, and reviews in that pool include a heat alarm that beeped with an amber LED within two months.
Pros
Cons
Best for: You want the lowest-priced complete smoke, heat and CO radio kit in this set, with a remote, and your existing alarms are not SM11R.
Less suitable: You already own first-generation SM11R heads, or you only need smoke alarms on one floor.
Specifications
Common questions
Will this talk to an older CPVAN SM11R set?
No. The listing says this second-generation pack is not compatible with SM11R.
Is a remote included?
Yes. The title is 4 pack plus 1 remote for mute, test and pair.
Can you drill-free mount them?
Bullets list magnetic pads as well as screws and anchors.
The CPVAN 6-pack at £115.99 is the larger second-generation bundle, with two remotes, and it shows the same 4.4 from 583 reviews as the 4-pack. This comparison counts four smoke alarms, one heat alarm and one CO alarm. Bullets allow up to 30 compatible CPVAN heads in the CP-SD01, FSI-3001, FSI-3002 and FSI-3003 family, plus extra FSI-RC remotes, and they still exclude SM11R. Magnets or screws are listed, with BS EN 14604, BS 5446-2 and EN 50291-1 claimed. UK reviews in the shared pool include a heat alarm that showed a beep and an amber LED within two months, which a new cell will not cure. It suits a larger house that wants spare smoke heads and a second remote in one order. £115.99 is the dearest kit here, and the star line is not evidence of a separate test.
Pros
Cons
Best for: You are covering a larger house in one order and you want a spare remote as well as extra smoke heads.
Less suitable: A three- or four-head layout would do, or you already have SM11R alarms to keep.
Specifications
Common questions
How is this different from the CPVAN 4-pack?
This listing is a 6-pack with two remotes at £115.99. The 4-pack listing is one remote at £79.99. Both are second generation and not SM11R-compatible.
Can you add more alarms later?
Bullets allow up to 30 compatible CPVAN alarms (CP-SD01 / FSI-3001, FSI-3002, FSI-3003) and extra FSI-RC remotes.
Do reviews mention early faults?
Yes. UK reviews include a heat alarm that showed a beep and amber LED within two months.
The WISUALARM S01 at £6.99 is a single alarm with two replaceable AA cells, and amazon.co.uk shows 4.4 from 272 reviews. The title is a 10-year sensor lifespan with a 5-year replaceable battery. The listing claims EN 14604, UKCA and 85 dB, with a silence button, pads or screws. It does not detect carbon monoxide and it does not radio-link to anything else. Reviews mention a battery cover that will not close until the cells are in, short screws, and a sticky pad some buyers did not trust. The head is about 10 cm across and weighs about 140 g. It is the lowest outlay here for one storey when you will change AAs yourself. The fixings are the recurring gripe, and a trigger in the hall stays in the hall.
Pros
Cons
Best for: You want one low-cost optical alarm for a single storey and you will keep spare AA cells.
Less suitable: You need interlink, a sealed cell, or a carbon monoxide alarm.
Specifications
Common questions
Is this a 10-year sealed battery?
No. The title is a 10-year sensor lifespan with a 5-year replaceable battery. Reviews describe two AA cells.
Does it detect carbon monoxide?
No. The product is a smoke alarm only.
Any fit issues?
Reviews mention a battery cover that will not close until the cells are in, short screws, and a sticky pad some buyers did not trust.
The FireAngel FA6620-R at £11.98 is one optical alarm with a sealed 10-year battery, and amazon.co.uk shows 4.3 from 8,044 reviews, the largest review file in this set. The listing claims BS EN 14604 and UKCA. The warranty stated on the page is five years, shorter than the cell life. FireAngel tells you to avoid bathrooms and kitchens because of nuisance alarms, and this ASIN does not describe radio interlink, so another floor will not hear it. Mounting is screws, with a quiet test on the button. It is a proven standalone when one smoke alarm on a living storey is the job. An early sealed-cell failure, which does appear in reviews, means a replacement rather than a new battery, and it is not an interlinked set.
Pros
Cons
Best for: You need one optical smoke alarm for a single living storey and you want the review file that is actually large.
Less suitable: You need a kitchen heat alarm, radio interlink, or a second floor that must sound at the same time.
Specifications
Common questions
Can you change the battery in the FA6620?
No. The listing fits a 10-year sealed battery. The warranty stated is 5 years.
Does FireAngel say to use this in a kitchen?
No. The bullets say to avoid bathrooms and kitchens because of nuisance alarms.
Will it link to other wireless alarms?
This listing does not describe RF interlink. Treat it as a standalone optical head.
The X-Sense HS21 at £47.99 is two SD19-W optical smoke alarms and one XH02-W heat alarm on Link+ radio, and amazon.co.uk shows 4.1 from 215 reviews. There is no carbon monoxide head and no app; the bullets say linking stays between the heads, with no base station. EN 14604 and BS 5446 are claimed, and mounting is by screws. The same page lists three CR123A cells in the box while the bullets describe a sealed 10-year battery, so the power story does not agree with itself. Saved reviews are mostly about a separate remote that would not pair, which makes the 4.1 a weak verdict on the alarms. It is the best value radio set here if you need smoke plus a kitchen heat alarm and you will buy CO separately. It is not a full smoke, heat and CO box.
Pros
Cons
Best for: You want the lowest-priced radio smoke-and-heat set in this comparison and you will cover carbon monoxide separately.
Less suitable: You need CO in the same box, or you want a phone alert when you are away.
Specifications
Common questions
Does the HS21 include a carbon monoxide alarm?
No. The kit is two SD19-W smoke alarms and one XH02-W heat alarm. There is no CO head in the listing.
Will it talk to an X-Sense app?
No. The bullets say there are no app features and no base-station connection. Linking is Link+ radio between the heads.
Can you add a remote?
A remote is not in this box. Reviews on the listing include controllers that would not pair; treat accessory compatibility as model-specific.
The WISUALARM S05 at £49.99 is three pre-linked optical smoke alarms with sealed 10-year cells, and amazon.co.uk shows 3.9 from 87 reviews, the lowest star line among the radio sets here. There is no heat alarm and no carbon monoxide alarm, so a kitchen is still uncovered if you stop at this box. The bullets say this type will not join a WISUALARM gateway. An infrared remote can hush the alarm, but that remote is not included. The listing claims EN 14604 and 85 dB, with adhesive or screws, and a humidity line up to 95% RH. At £49.99 it costs about the same as the X-Sense pack that includes a heat alarm. You pay a similar mid price and get smoke heads only.
Pros
Cons
Best for: You already have a kitchen heat alarm and a CO alarm, and you only need three linked smoke heads.
Less suitable: The kitchen still needs a heat alarm, or you expected a phone gateway in the same family.
Specifications
Common questions
Does this 3-pack include a heat alarm?
No. It is three wireless smoke alarms only. A kitchen still needs a compatible heat head if you want that coverage.
Can it join a WISUALARM gateway?
No. The bullets say this type is not compatible with the Wisualarm gateway.
How do you silence it without a ladder?
Bullets allow an infrared TV-style remote. That remote is not in the box.
This second XUK listing is the same PA-437EN at £49.99, and the listing has no customer-review block, so there is no star rating to judge. Size, weight and the 85 dB claim match the £21.99 ASIN, with an ABS body, a replaceable battery and a humidity range of 10% to 85% printed here. Linking is still 2.4 GHz Tuya or Smart Life. No radio interlink is stated, and no British smoke-alarm standard is named. You pay more than double the other shelf price for a card that does not add reviews or a siren network. Nothing on this card shows a different sensor. Use the £21.99 listing if you want this model at all, and skip both if one trigger must sound the rest of the house.
Pros
Cons
Best for: There is no strong case in this capture while the same PA-437EN is listed at £21.99.
Less suitable: You are choosing on price or on review evidence, or you need interlinked sirens.
Specifications
Common questions
Is this a different model from the £21.99 XUK listing?
The listing uses the same PA-437EN model and the same Wi-Fi bullets. This ASIN has no star rating on the card.
Does it radio-link to other smoke alarms?
No RF interlink is stated. Linking on the card is 2.4 GHz Tuya/Smart Life.
Are there UK reviews on this ASIN?
This listing has no customer-review block, so there is no star rating to judge.
We compared 12 wireless smoke alarm listings on amazon.co.uk, taken from a wider look at radio kits, standalone heads and one Wi-Fi model. Scores use the UK shelf price, star rating, review count and the listing text. They are not a laboratory fire test. Scottish Government, GOV.UK and legislation.gov.uk pages set the England, Scotland and Wales duties. There is no methodology note in the display folder, so the top pick and the best value follow the awards already on the product cards.
Link type
30%Radio interlink, so one trigger sounds the other heads, comes before Wi-Fi. Scottish guidance says the alarms do not need Wi-Fi. An app alert is only for when you are away.
Box contents
25%A useful kit has smoke heads plus a kitchen heat alarm, and carbon monoxide if there is a boiler, fire or flue. A smoke-only pack leaves the kitchen uncovered.
Power
20%A self-fitted Scottish system on the buyer page uses a sealed tamper-proof lithium cell. A 9 V cell does not meet that page. Welsh rentals need alarms on the mains.
Standards claimed
15%The buyer-facing lines are BS EN 14604 for smoke, BS 5446-2 for heat, and Kitemark EN 50291-1 for CO. A bullet is only a claim. A stated warranty matters because the cell is sealed.
Same brand
10%Groups stop at 24 or 30 heads of that maker. CPVAN’s second generation is not compatible with SM11R, so an older set cannot simply grow.
Buy the link type before the brand. A radio set sounds the other heads. A Wi-Fi alarm messages a phone and leaves the landing quiet. Then match the box to the rooms: smoke in living space and halls, heat in the kitchen, carbon monoxide where there is a boiler, fire or flue. England, Scotland and Wales do not share one rule, so a line that says both nations are covered is not a legal result.
A wireless smoke alarm on this page is one of two things. A radio-interlinked set sounds the other heads in the same brand group when one triggers. A Wi-Fi unit sends a phone alert. Scottish guidance says the alarms do not need Wi-Fi. An app alert is only for when you are away. The XUK PA-437EN in this set is the 2.4 GHz example. A UK review describes a 9 V battery and no link to other alarms, so a landing alarm does not sound with it.
The XUK PA-437EN notifies a phone on 2.4 GHz. A UK review says it does not link to other alarms. Scottish guidance says the alarms do not need Wi-Fi. One trigger will not sound the rest of the house.
Scotland asks for a heat alarm in the kitchen. FireAngel tells you to avoid kitchens because of nuisance alarms. A smoke-only pack such as the WISUALARM S05 leaves that room uncovered.
Regulation 5 requires smoke alarms on the electrical supply, linked to the other mains smoke alarms. The sealed cells on this page do not meet that rule. Existing contracts had until 1 December 2023.
Radio interlink is the first cut. When one head triggers, the other heads in that maker’s group should sound. Scottish guidance says the alarms do not need Wi-Fi. An app alert is only for when you are away. The full radio kits here are LINKD, both CPVAN packs and XINDUM. Partial radio sets are the X-Sense HS21, two smoke alarms and one heat alarm, and the WISUALARM S05, three smoke alarms only. The XUK PA-437EN is the Wi-Fi single. It joins Tuya or Smart Life on 2.4 GHz.
The second cut is what is in the box. A Scottish layout needs smoke in the room you use most, smoke in every hall and landing, and a heat alarm in the kitchen, ceiling mounted and interlinked. Carbon monoxide is required for a boiler, fire or flue. It need not link to the fire alarms, and a battery CO alarm must be sealed. LINKD is three smoke, one heat and one CO, with a Kitemark claim on the CO alarm only. Do not call every listing Kitemarked.
Three typical situations, each with a recommendation from this comparison.
You are covering a Scottish home with ceiling-mounted interlinked alarms and a kitchen heat alarm, and you can fit a sealed battery kit yourself. The LINKD box adds carbon monoxide in the same order. A failed sealed cell means a new head.
The English landlord duty is one smoke alarm on each living storey. Interlink is not required. The FireAngel FA6620 is one optical head with the largest review file here. A CO alarm for a fixed combustion appliance, other than a gas cooker, is still a separate requirement.
You already have alarms that sound in the house and you want a message on your phone. The XUK PA-437EN at £21.99 joins Tuya or Smart Life on 2.4 GHz. It does not radio-link other heads, and the file is only 13 reviews.
The top pick is the LINKD kit at £99.99: three smoke alarms, one heat alarm and one carbon monoxide alarm, pre-linked by radio, with 4.5 from 813 amazon.co.uk reviews and a Kitemark claim on the CO alarm. The best value radio set is the X-Sense HS21 at £47.99, two smoke alarms and one heat alarm, if you will cover carbon monoxide separately. A standalone head with a large review file, such as the FireAngel FA6620, does not sound the rest of the house. Wi-Fi on the XUK PA-437EN is a phone alert, not radio interlink. One bundle does not make a home legal in both England and Scotland.
X-Sense HS21
Two optical smoke alarms and one heat alarm at £47.99 on Link+ radio, if you buy carbon monoxide separately.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources listed below, plus amazon.co.uk shelf prices and ratings for these ASINs, last checked on 19 October 2026.
This page contains affiliate links to amazon.co.uk with the tag pcuk26-21. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the UK listing lines from 19 October 2026. We did not run a lab test.
