FireAngel One Smart Smoke and Heat Alarm: What It Does and How to Fit It

The FireAngel One Smart BLE Combi Smoke Heat Alarm, model code FA8922BW-R, is a single ceiling unit that watches for both smoke and a rapid rise in heat. FireAngel describes it as combining intelligent smoke and heat detection in a single device, using UltraSense smoke sensing alongside Class A1 heat detection, and it runs on a sealed lithium battery rated for 10 years¹. It is certified to EN 14604 and BS 5446-2:2003¹.

What makes it different from a plain alarm is the Bluetooth link. You can interconnect up to 20 compatible FireAngel One alarms, and if one interconnected alarm detects a fire, every connected alarm sounds¹. That matters most at night, when a fire in the kitchen needs to wake someone upstairs.

This page covers what the alarm does, where the maker says to fit it, how to link alarms with the Angel Connect app or by hand, and what to do when the battery runs low. It is a description of one product and its instructions, not a comparison with other alarms.

What the FireAngel One Smart alarm does

The unit is a dual-sensor alarm: it looks for smoke and it also watches temperature. FireAngel says the combination of UltraSense technology and Class A1 heat detection is what lets one device cover both jobs¹. Cornwall Fire and Rescue Service describes combined optical smoke and heat alarms in the same terms, as combinations in one unit that reduce false alarms while increasing the speed of detection³.

That dual approach is the reason the maker lists it for rooms where either sensor alone would be awkward. A smoke sensor in a kitchen can be set off by burnt toast; a heat sensor alone will not react to a slow, smouldering fire. Putting both in one unit is a compromise aimed at general living spaces.

The alarm is built for ordinary homes. FireAngel lists it as suitable for houses, flats, bungalows, maisonettes, caravans and motorhomes¹. It measures 118mm across and 49mm deep, and it is manufactured using recycled plastic¹. Built-in diagnostics, read through the Angel Connect app, help keep the alarm performing at its best, according to the maker¹.

It is part of a wider family. FireAngel One is a connected range of smoke, heat and carbon monoxide alarms designed to provide protection throughout the home, and the alarms interconnect using Bluetooth⁴. If you want a heat-only unit for a garage or a smoke-only unit for a landing, those exist in the same range; this page is about the combined model.

Where to fit it: kitchens, living rooms, hallways, landings and caravans

FireAngel lists the One Smart Combi for open-plan kitchens, living rooms, hallways, landings and dining rooms¹. That list is wider than a heat-only alarm's, because the smoke sensor adds detection the heat sensor alone would miss.

The general rule from the fire and rescue services is to spread alarms through the home, not just the hall. London Fire Brigade advises fitting a smoke alarm in any room where a fire can start, for example any room where you smoke or leave appliances plugged in, not just in the hall and landing⁵. Manchester Fire and Rescue Service says to fit a minimum of one working smoke alarm on every level of your home, preferably in a circulation space such as a hallway or landing⁶. FireAngel's own minimum is the same: one smoke alarm on every storey, including hallways and landings, with more in every bedroom, living room and dining room for better coverage⁷.

Heat alarms have their own place. FireAngel says heat alarms are perfect for detecting fires like those caused by faulty white goods, because they usually create a blast of heat, and that they will not false alarm in dusty or humid rooms, making them suitable for kitchens, utility rooms and garages¹. The maker's fitting guidance for its heat alarms lists kitchens, utility rooms, boiler rooms, attics and garages⁸. If you are deciding between a heat alarm and a smoke alarm for a particular room, our guide to heat alarms and where they go sets out the difference.

For caravans and motorhomes, FireAngel says most of its sealed battery smoke and heat alarms are compliant for motorhomes, and that in a static caravan carbon monoxide alarms should be mounted to the wall rather than free standing¹. The same page on caravan and boat safety is worth reading before you fit anything in a leisure vehicle.

Interlinking up to 20 alarms so every alarm sounds

The point of linking alarms is time. If a fire starts in the kitchen while everyone is asleep upstairs, a single alarm in the kitchen may not wake anyone. Linked alarms solve that: if one interconnected alarm detects a fire, every connected alarm sounds¹.

The One Smart Combi will interconnect with up to 20 compatible FireAngel One alarms over Bluetooth¹. FireAngel's manual for the Bluetooth range explains the behaviour plainly: if one alarm sounds, all alarms will sound, and you can press the Test button to locate the alarm that was triggered first¹⁰. That last detail is useful in a large house, because it tells you where to look rather than leaving you to search.

Linking is not limited to one type of alarm. FireAngel One is a connected range of smoke, heat and carbon monoxide alarms, so a household can build coverage across the home with devices that all talk to each other⁴. The maker's Pro Connected range works on the same principle, with wireless interlinking so that if one alarm is triggered all alarms in the home sound¹¹.

A few practical points follow from this:

• Plan the set before you buy, because the limit is 20 alarms per linked group¹.
• Put the alarm you will hear first in the room most likely to have a fire, and make sure the landing alarm is linked to it.
• Test the link after fitting, using the Test button, and check that every alarm sounds¹⁰.
• If you extend the house or add a caravan, check the new alarm is a compatible FireAngel One device before assuming it will join the group¹.

Our guide to interlinked alarms explains how linking works across brands and systems.

Setting up with the Angel Connect app or pairing by hand

There are two ways to link One Smart alarms: through the Angel Connect app, or by pressing the Test buttons in sequence. Both are the maker's own instructions.

With the app, download Angel Connect, which is available for iOS and Android devices, and set up an account. Tap Add device, select the device from the dropdown menu, then pair by pressing the Test button three times and wait for the success message¹. The app lets you control LED functions, test interlinked alarms and monitor your home's safety remotely, whether you are at home or away¹². Diagnostics reports appear on the app dashboard¹².

By hand, the sequence is different and worth following exactly. Set the first alarm to Secondary mode by pressing the Test button three times in quick succession. Install the alarm onto its baseplate, then press the second alarm's Test button five times in quick succession. When the devices locate each other the red LED flashes and both chirp once to confirm; repeat for further alarms¹.

The LED flashes tell you which mode an alarm is in. FireAngel One devices have two pairing modes: Primary mode, indicated by a fast-flashing red LED, and Secondary mode, indicated by a slow-flashing red LED¹.

When the battery runs low: Sleep Easy and replacing the alarm

The One Smart Combi uses a sealed lithium battery rated for 10 years¹. Sealed means you do not change it; when the battery reaches the end of its life, the alarm is replaced as a unit. FireAngel's advice is that if the battery stops working you will need to replace it if it is removable, or else you may need to replace the entire device, and to check with customer support if you think there is a fault¹.

A low battery chirp at 3am is the classic alarm annoyance, and the maker has a feature for it. Sleep Easy temporarily silences low battery notifications overnight and reminds you to replace the batteries the following day¹. On FireAngel's SP500 datasheet the same feature is described as allowing a low battery chirp to be silenced for 8 hours, up to 10 times¹³. Treat that as a night's grace, not a fix: the alarm still needs attention the next day.

If the alarm is chirping and you are not sure why, our page on why a smoke alarm keeps chirping walks through the usual causes. If the unit is simply old, see when to replace a smoke, heat or CO alarm.

Warranty, certification and UK support

The warranty period is usually between 3 and 5 years, but check your alarm packaging and manual for up to date information, and keep your receipt because it is needed for the warranty to be valid¹. Some FireAngel models carry a 7 year life guarantee, according to independent guidance from the CO Gas Safety site, so read the paperwork that comes with your unit rather than assuming¹⁴.

On certification, FireAngel states the One Smart Combi is certified to EN 14604 and BS 5446-2:2003¹. The same product page also refers to SGS, a UKAS-accredited third-party certification body. The two statements sit alongside each other on the maker's page and are not reconciled there; if certification matters for a tenancy or a specification, ask FireAngel support to confirm in writing. FireAngel more generally states a BSI Kitemark and independent certification, and lists a compliant range for England, Wales and Scotland⁷. Our guide to alarm standards explains what those marks mean.

FireAngel is a UK brand established since 1998 and based in Coventry, according to its own product pages⁷. Support is straightforward:

• FireAngel Customer Support: 0330 094 5830².
• The same UK number appears in FireAngel manuals¹⁵.
• If your alarm was fitted by Greater Manchester Fire and Rescue Service and is still covered by its guarantee, call freephone 0800 141 2561¹⁶.
• For general alarm problems, some fire services signpost telephone 0800 141 2561 or email technicalsupport@fireangeltech.com¹⁷.

If you would rather have your home assessed, many fire and rescue services run home fire safety visits, which can include advice on alarms and fitting; contact your local service to ask what it offers¹⁷. Our section on home emergencies covers what to do if a fire does start, and the FireAngel brand page lists the wider range.