Due to Industrial action in France some delays are expected to orders - click here for more info

Nest S3003LW 2nd Generation Smoke & Carbon Monoxide Alarm Product Code: 8523H

Smart smoke and carbon monoxide alarm. Industrial-grade, split-spectrum sensor detects fast and slow-burning fires. Can be controlled from, and will send alerts to, a smartphone. Sensor lasts up to 10 years.


  • 85dBA Alarm
  • Mains-Powered
  • 2 Year Manufacturer's Guarantee (T&Cs Apply)
  • Automatic Test Function
  • Override Function
  • Split-Spectrum Sensor
  • Smartphone Control
  • Battery Back-Up


230V. BS EN 14604, BS EN 50291-1.
Additional Information
Technical Specification
  • Power Source : Mains-Powered
  • Brand : Nest
  • Product Type : 2nd Generation Smoke & Carbon Monoxide Alarm
  • Alarm Product Type : Smoke & CO
  • Model Name : Protect
  • Fixings Supplied : Fixings & Fittings Supplied
  • Current Type : AC
  • Total Product Weight : 0.37 kg
  • Model No : S3003LW
  • Battery Duration : Replacement Battery (Lithium)
  • Wireless/Wired : Wireless
  • Alarm Sensor Type : Electrochemical
  • Battery Type : AA
  • Colour : White
  • Pack Size : 1
  • Power Voltage Supply : 230 V
  • Manufacturer Guarantee : 2 Year Manufacturer's Guarantee (T&Cs Apply)
  • Pieces in Pack/Case : 1
  • CE Standard (Tested to EN...) : BS EN 14604, BS EN 50291-1.
Product Contents
Nest Protect, backplate, 2 x AA batteries and fixings.
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


Click here to see information on returns and cancellation

€103.95 Incl. 20% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
Nest S3003LW 2nd Generation Smoke & Carbon Monoxide Alarm is rated 4.3 out of 5 by 3.
Rated 5 out of 5 by from Exceeded expectations I had the 1st gen of these and promptly removed them after a false alarm about my house being on fire (it wasn't) and all the stress and effort that goes along with that. I went with regular wired alarms but recently one of the smoke alarms started going off for no reason. After a lot of research I decided to cautiously go with this 2nd gen alarm. I'm so happy I did. Setup and installation was a cinch (I went with the wired option) as they give you all you need including wire connectors. It took about 10 minutes per alarm with basic tools. The app is much improved from the first gen and this current model has performed well so far. The fact it runs its own healthcheck, has a night light and looks well is a bonus over the expected functionality such as smoke and carbon monoxide. Add in a 10 year life span and it becomes more financially justifiable. I managed to get mine on sale which was a bonus as I was looking for two. I'll add more in due course and would happily recommend to anyone looking to upgrade/replace/add new dectors.
Date published: 2019-07-30
Rated 4 out of 5 by from Great alarm, a little awkward to install Good alarm with excellent features - very easy to set up and use. The actual physical installation was a bit awkward, you need a very large gap for the power cabling to get through unobstructed.. That's the only gripe though.
Date published: 2019-07-15
Rated 4 out of 5 by from Great product, easy set up I bought this to replace an existing fire alarm that had expired (approx 10yr lifespan). Purchased wired option, installed in a couple of minutes after set up. Very good, checks it’s status and battery every day, and reports accordingly. €117 not cheap for smoke/carbon monoxide alarm but functionality is great and makes it a viable purchase.
Date published: 2018-03-29
  • y_2019, m_12, d_11, h_14
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.3
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_3
  • loc_en_GB, sid_8523H, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie