FireAngel heat alarm with packaging, labelled Grade D1, for mains powered and backup use.

Spec+ Optimised Heat Alarm: white, circular with central button and indicator lights.

Spec+ Optimised Heat Alarm with central button, minimalist design, shown on white background.

Spec+ Optimised Heat Alarm and its packaging with orange and white branding.

Spec+ Optimised Heat Alarm, white and circular with a central test button, on a white background.

Spec+ Heat Alarm on a white ceiling in a kitchen with grey cabinets and appliances.

SP510

Spec+ Optimised Heat Alarm

Name: Spec+ Optimised Heat Alarm
Brand: FireAngel
SKU: SP510
Availability: InStock

High-precision heat detection

The Spec+ Optimised Heat Alarm is a Grade D1 alarm, with Class A1 heat detection, helping meet BS 5839-6 requirements.

Designed for professional installations, it supports efficient specification across domestic, social housing, HMOs, new build and private rented properties.

With AC mains power and a rechargeable lithium backup, it maintains protection during power interruptions, helping reduce risk and support compliance. Built-in Bluetooth Low Energy (BLE) interlink comes as standard, with optional hardwired connection for flexible interconnection and coordinated alerts.

Bluetooth Low Energy
Smart silence
Quiet self-test
Alarm memory
Sleep Easy™
Night sensing
Low-battery warning
Fault indication

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GET IN TOUCH PRODUCT SUPPORT

The Spec+ Optimised Heat Alarm is a Grade D1 alarm, with Class A1 heat detection, helping meet BS 5839-6 requirements.

Designed for professional installations, it supports efficient specification across domestic, social housing, HMOs, new build and private rented properties.

Installation & setup

Get the help and support you need to easily set up and install your FireAngel alarm for instant protection.

Installation guide

Click the icon to view best practice guidance for installing FireAngel alarms

Maintenance guide

Click the icon to find out how to maintain and test your alarm

Resources

For more technical and specification information on this alarm, view our manual and datasheet.

Product manual

Click the icon to download the product manual

Datasheet

Click the icon to download the product datasheet

Key features and benefits

Class A1 heat detection

High-sensitivity device triggering alarms at set temperatures or rapid rises

Lever clip installation

Pushlock AC terminal block reduces installation time

Quiet self-test

Self-test functionality alerts landlords if an alarm is not operating correctly, providing greater confidence that systems remain operational between scheduled inspections

AC power with rechargeable lithium backup

Grade D1 alarm ensures continuous operation during power outages, keeping properties protected. Includes 10-year rechargeable lithium battery to maintain protection during power interruptions

Installing Spec+

The Spec+ Optimised Heat Alarm is a Grade D1 alarm designed for efficient installation across a wide range of property types. Its compact design and standard mounting allow for quick, consistent fitting in both new build and retrofit applications, helping reduce time on site. Approved for use in Scotland under the Scottish Tolerable Standard, it meets BS 5839-6 requirements for domestic installations.

Suitable for installation in kitchens, boiler rooms, garages and utility rooms, the Spec+ range supports flexible placement throughout the property. Interconnection capability allows up to 50 devices to be linked for whole-building coverage, making it well suited to HMOs, social housing and multi-occupancy buildings requiring a coordinated alarm response.

With a 10-year lifespan and compliance with current safety standards, it provides a reliable, long-term solution for professional installations across multiple property portfolios.

Compliant and certified for safety

The SP510 / FA4250BW-T Spec+ Optimised Heat Alarm meets BS 5446-2:2003 for domestic heat alarms.

BS 5446-2:2003 certified

Tested and certified for domestic heat alarm performance

SGS independently tested

Verified for reliable and consistent heat detection by the world’s leading Testing, Inspection and Certification company

10-year warranty

Manufacturer-backed cover for a full decade of protection and support

What's in the box?

Person scanning a Spec+ Multi-Sensor Smoke, Heat & CO Alarm box with mobile on cluttered table.

Everything supplied with the SP510 Optimised Heat Alarm

✓ Heat alarm unit
✓ Ceiling base plate
✓ Screws and wall plugs
✓ Dust cover (fitted)
✓ Installation and user guide

Reviews from our customers

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Related FAQs

Does the Spec+ range include a rechargeable battery?

Yes. The core five alarms in the Spec+ range are powered by standard household mains electricity and include a Panasonic rechargeable lithium backup battery. This ensures the alarm continues to operate during power outages, providing uninterrupted protection. The long-life battery is designed to last for the life of the alarm, reducing maintenance and eliminating the need for routine battery replacements.

Why does the Spec+ range use Bluetooth Low Energy (BLE)?

The Spec+ range uses Bluetooth Low Energy (BLE) to provide fast, secure wireless connectivity for simplified setup, device pairing and ongoing maintenance through compatible mobile apps and smart building systems. Exclusive to the FireAngel Professional range, BLE prevents interference or cross-connection with devices outside the network, ensuring reliable performance. It also enables up to 50 alarms to be wirelessly interconnected, delivering a coordinated whole-building response that makes the Spec+ range ideal for HMOs, social housing and other multi-occupancy properties.

Why is the Spec+ range product certified by SGS?

The Spec+ range is certified to the same UKAS-recognised standards required for the UK market as products certified by other recognised bodies. FireAngel has chosen SGS as its certification partner because it is a globally recognised testing and certification organisation with over 150 years of experience, providing independent verification of product safety and performance.

What happens if the FireAngel Angel Pro app isn’t working?

The FireAngel Angel Pro app is designed to support installation, setup and diagnostics, but it is not required for the alarms to operate. The SP500 / SP510 / SP520 / SP530 / SP540 can all be installed and configured manually, ensuring protection is not dependent on the app. These are alarm-first products, with the app simply providing additional convenience, visibility and support for installers and customers.

See all faqs

Bluetooth Low Energy

Bluetooth Low Energy (BLE) is a low-power wireless technology for short-range data transfer in IoT, wearables and smart home devices.

Smart silence

Smart silence allows you to stop an alerting alarm from chirping for 10 minutes.

Quiet self-test

Quiet self-test checks your alarm at a volume at least 10dB below full level without disturbing others. Double-press for a full 85dB test.

Alarm memory

Alarm memory lasts 7 days. LED flashes for the first 3 days. Press test to recall events or hold 10s to clear the memory.

Sleep Easy™

Sleep Easy™ mode stops low battery beeps overnight without compromising heat protection.

Night sensing

Automatically detects low ambient light levels and adjusts the alarm’s indicators or behaviour during night time hours.

Low-battery warning

When the battery is low, the yellow fault LED will flash once with a chirp every 40 seconds.

Fault indication

The alarm performs regular self-tests. When a fault is detected, the yellow LED will flash twice with 2 chirps every 40 seconds.

End-of-life warning

When the alarm reaches the end of its life (EOL), the yellow LED flashes with 3 chirps every 40 seconds. The alarm must be replaced within 30 days.

Spec+ range

See our full product offering here.

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Compliant innovation

FireAngel Spec+ is a complete Grade D1 fire and carbon monoxide alarm portfolio, developed for UK housing professionals and aligned with BS 5839-6.

Spec+ pairs advanced sensing with built-in connectivity and an installer-friendly design, helping housing providers protect residents while keeping installation and long-term compliance simple.

FireAngel’s Design Service, CPD training and technical team support every stage, so you can specify and install Spec+ with confidence.