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How to choose a wireless smoke alarm

Updated: 21 October 2026

You are on amazon.co.uk with a dozen listings that all say wireless. One is a single alarm that only sounds in that room. Another is a radio set, so a trigger in the hall sets off the landing. A third pings your phone over Wi-Fi and leaves the rest of the house quiet. This wireless smoke alarm buying guide puts those three types in order before the star rating. The [wireless smoke alarm comparison](/hub/fire-protection/wireless-smoke-alarm) holds the prices and the review counts. The shopping order is link type, then power, then whether heat and carbon monoxide are in the box. A qualifying purchase can earn a commission at no extra cost to you.

You are on amazon.co.uk with a dozen listings that all say wireless. One is a single alarm that only sounds in that room. Another is a radio set, so a trigger in the hall sets off the landing.

Our top picks

LINKD LINKD smoke, heat and CO

Best overall

LINKD LINKD smoke, heat and CO
9.2/10about £99.99
View offer
XUK XUK PA-437EN

Alternative

XUK XUK PA-437EN
9.2/10about £21.99
View offer
X-Sense X-Sense HS21

Best value

X-Sense X-Sense HS21
8.4/10about £47.99
View offer
On this page
  1. 1.What wireless means on amazon.co.uk
  2. 2.Criteria in order
  3. 3.How many heads for a typical house
  4. 4.What this comparison's packs actually contain

What wireless means on amazon.co.uk

On these listings, wireless is a label, not a standard. Standalone alarms in this set, such as the FireAngel FA6620, the TEFLERON pair and the WISUALARM S01, have no radio interlink printed on the card. Each head warns the room it is in. Radio-interlinked packs are sold as RF sets: one trigger is meant to sound the linked heads. Scottish Government guidance says interlinked alarms use radio frequency and do not need Wi-Fi. The XUK PA-437EN joins 2.4 GHz Tuya or Smart Life so the phone gets a notice. The Wi-Fi versus radio page sets out that split.

Criteria in order

Decide the link before you compare stars. If one alarm must wake the whole home, you are in the radio rows, not the standalone rows and not the Wi-Fi row. A sealed 10-year lithium cell is the battery class Scottish guidance accepts for a self-fitted system. You cannot change that cell. Read the standards line last, and read it as a claim. A bullet is not a certificate. The LINKD listing attaches that Kitemark claim to the CO alarm, not to every head in every brand.
LINKD LINKD smoke, heat and CO

Testsieger

LINKD LINKD smoke, heat and CO
9.2/10about £99.99
View offer

How many heads for a typical house

Fire Kills asks for at least one smoke alarm on every level of the home. That is guidance for any UK home, not the landlord duty. A 3-pack of smoke-only alarms, such as the WISUALARM S05 at about £49.99, still leaves the kitchen short. The best wireless smoke alarm page matches named packs to those jobs once you know the count.

What this comparison's packs actually contain

Shelf prices below are the amazon.co.uk figures captured on 19 October 2026. Under about £20 you are looking at standalone heads, from the WISUALARM S01 at about £6.99 to the WISUALARM SA20A at about £18.69. The XUK Wi-Fi alarm is about £21.99, or about £49.99 for the same PA-437EN on a second listing with no reviews. From about £80 the CPVAN 4-pack at about £79.99 is the cheapest complete kit. The HS21 bullets say a sealed 10-year cell while the box list includes CR123A cells.

Common questions

Do I need RF interlink or is a two-pack of standalones enough?
Standalones are enough when each alarm only has to warn the room or the single storey it sits on, which is the shape of the English landlord minimum. Radio interlink is what you buy when a trigger must sound the other heads, including the Scottish layout of living room, halls and kitchen heat. A two-pack such as the TEFLERON or the SA20A does not provide that link. If people sleep upstairs with the door shut, assume a lone downstairs alarm will not do the waking.
How many alarms does a two-storey house need?
Fire Kills asks for at least one smoke alarm on every level. Scotland, for every home, also wants the living room, every hall and landing, and a kitchen heat alarm, interlinked and on the ceiling. A two-storey house often needs two or three smoke positions plus heat, and a sealed CO alarm if there is a boiler, fire or flue. Match the pack to that count. A smoke-only 3-pack does not become a full house kit because it has three heads.
Should I choose a sealed 10-year cell or a replaceable battery?
Choose the sealed tamper-proof cell when you are fitting the long-life battery system those UK pages prefer, and when a Scottish home needs that class rather than a 9 V or loose AA. Choose a replaceable battery when you want to service the alarm yourself and no duty forbids it. The drawback of the sealed cell is real: reviews include early chirps, and you replace the whole alarm. The drawback of the replaceable cell is that someone can take it out and leave the head dead.
Does the box need a heat alarm?
Yes, if the kitchen is part of the cover you are trying to buy. Optical smoke next to a cooker false-alarms, and Scottish homes are told to use a heat alarm in the kitchen. The HS21, LINKD, XINDUM and both CPVAN kits include heat. The S05 3-pack and every standalone in this set do not. Heat is not a substitute for smoke on the landing, so do not put the only heat head in the hall.
Can I mix brands later?
No. These radio groups stay inside one maker, and CPVAN's current packs exclude SM11R. Buy the family you can add to, up to the 24 or 30 heads that listing states. A spare FireAngel will not extend an X-Sense Link+ group. If you might add a landing next year, start with a brand that still sells a matching head, not a one-off pair.
Is a pre-linked bundle worth the extra money?
It is worth it when the box already contains the smoke, heat and, if you need it, CO heads you counted, because you skip a pairing ritual and you still only trust the system after a test. It is not worth it when you are paying about £80 to £116 for sensors you do not have rooms for. Pre-linked is a convenience, not a legal certificate. The standards text on the bullet list remains a claim until you know which standard each head is actually sold against.

Related pages

Smoke alarm rules by nation

Wireless smoke alarm

Best wireless smoke alarm for the UK home you have

How to install a wireless smoke alarm on the ceiling

Wi-Fi smoke alarm versus radio interlink, explained

Sources

Public UK sources listed below, plus amazon.co.uk shelf prices and ratings for these ASINs, last checked on 19 October 2026.

  1. Scottish Government: fire and smoke alarms in Scottish homes (retrieved 19 October 2026)
  2. Scottish Government: where and what to buy (retrieved 19 October 2026)
  3. Scottish Government: Tolerable Standard guidance on fire and carbon monoxide detection (retrieved 19 October 2026)
  4. Scottish Government: changes to fire safety laws (retrieved 19 October 2026)
  5. GOV.UK: smoke and carbon monoxide alarms, England regulations Q&A for landlords (retrieved 19 October 2026)
  6. legislation.gov.uk: Wales regulation 5, smoke alarms (retrieved 19 October 2026)
  7. GOV.WALES: fitness for human habitation guidance (retrieved 19 October 2026)
  8. EDA summary of BS 5839-6:2019 changes (retrieved 19 October 2026)