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Replacement for Ei141 and Ei141RC Mains Powered Smoke Alarms

Front view of replacement mains powered smoke alarm showing the main circular unit with button and vents
4.9 out of 5 stars

20+ In Stock

Estimated dispatch: Tomorrow

£38.75 inc VAT

£32.29 ex VAT

Standard Delivery

Will usually be delivered in 2-3 working days

£4.20 inc VAT

Next Day Delivery

Will usually be delivered the next working day

£7.00 inc VAT

The Ei141 is a mains powered smoke alarm with alkaline back-up battery. As all Ei141 alarms use older ionisation smoke detection technology, they are now being discontinued. If you need to replace an Ei141, the Ei146e which uses optical smoke detection is 100% compatible with your existing base plate and alarm system. This means you don't need to spend a penny on an electrician or worry about the disruption of rewiring works.

The new alarm can interlink with any other Ei140/140RC series alarms remaining in your system, along with many other Ei Electronics / Aico models. The more modern optical sensor technology in the Ei146e is less susceptible to false alarms, making it suitable for use in a wider range of locations such as rooms adjacent to kitchens, hallways, landings, bedrooms, and living areas.

  • Power: 230V mains powered with back-up battery
  • Back-up Battery: Replaceable 9 Volt alkaline battery
  • Warranty: 5 year warranty
  • Suitable for living rooms, dining rooms, bedrooms, hallways and landings
  • High performance optical sensor most suitable for detecting slow, smouldering fires
  • Fits onto your existing Ei141 alarm base (easi-fit base included to keep as a spare)
  • Suitable for installations complying to BS 5839-6 Grade D2
  • CE and Kitemarked to BS EN 14604: 2005
  • Piercing 85dB warning alarm
  • Combined test and silence button

The simple installation process of the Ei146e replacement alarm eliminates the need for an electrician. However, power to all alarm circuits should be cut before removing and replacing any mains powered alarm.

Customer Reviews

Customer Reviews (83)

4.9 out of 5 stars

Reviews by Real Customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5

Reviewed by

T O

Published on

25th January 2026

Very good

Rating: 5 / 5

Reviewed by

T B

Published on

29th December 2025

Well packaged, prompt delivery and easy replacement of old system.

Rating: 5 / 5

Reviewed by

P M

Published on

1st December 2025

Has an issue with payment address, telephoned & respondent was very helpful 7 issue resolved immiediately.

Rating: 5 / 5

Reviewed by

M H

Published on

18th November 2025

Super easy to install

Rating: 5 / 5

Reviewed by

S S

Published on

3rd November 2025

Excellent value for money, speedy delivery and have subsequently purchased more

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Technical Data

Technical Data

Product Code EI146E
Brand EI Electronics
Back-Up Battery Type Alkaline
Battery Type 9V Battery
British Standard Grade Grade D2: Mains Powered (replaceable backup)
Colour White
Local Legislation Scottish Legislation (2022)
Welsh Legislation (2022)
Approvals & Markings CE Marked
Compliance BS 5839-6
BS EN 14604: 2005
Connection Wired
Display LED Indicators
Fixing Options Screws (included)
Installation Position Ceiling
Material Plastic
Maximum Number of Linked Devices 12 Devices
Operating Temperature -10°C To +40°C
Positioning Bedrooms
Hallways
Living Rooms
Power Type Mains Powered (230V)
Product Range Aico Ei140e Series
Recyclable Yes - Valpak's WEEE Distributor Take-back Scheme
Relative Humidity 15% To 95%
Sensor Type Optical
Sound Level 85dB
Suitability Home
Warning Type Audible - Alarm Sounder
Warranty 5 Years
Dimensions (Unit)
  • Height: 47mm
  • Diameter: 148mm
Weight 350g
Datasheets