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Easichange® Replacement Smoke Alarm for Ei166, Ei166RC and Ei166e

48 Customer Reviews
£46.55 inc VAT
£38.79 ex VAT
Product Overview

The easichange® Ei166EK replacement head kit has been specifically designed to allow an Ei166, Ei166RC ir Ei166e optical smoke alarm head (the main and most visible part of the smoke alarm containing the sensor and the electronics) to be replaced at the end of its life without the need of an electrician. The kit is a genuine Ei Electronics product and contains an Ei3016 alarm head and a simple guide showing how to quickly and safely replace your smoke alarm head. A free specially designed removal tool is also included in every order of Easichange alarms. The smoke alarm base with the wiring is left on the ceiling in this process.

  • Genuine Ei3016 replacement optical smoke alarm head
  • Rechargeable lithium back-up battery (included)
  • Supplied complete with removal tool
  • 5 year warranty
  • Test and Hush (silence) button
  • Kitemarked to BS EN 14604: 2005
  • Suitable for installations complying to BS 5839-6: 2019 Grade D1
  • CE marked

The simple installation process of the easichange® replacements kits negates the need of an electrician.

Technical Data
Product Code EI166RCEK
Alternative Product Codes Ei166, Ei166RC, Ei166e, Ei166EK, EI3016
Brand EI Electronics
Back-Up Battery

Longlife Lithium Battery

Dimensions (HxWxD)


Operating Temperature

0°C to 40°C

Relative Humidity

15% to 95% Relative Humidity

Sound Output


Weight 0.32kg
Product Datasheets
FAQs (2)
Q. Can I upgrade an existing Ei140 series base with a Ei160 series smoke alarm?

Yes, the bases for the Ei140 and Ei160 series are identical units and are interchangeable.

Q. Do you supply a tool to remove a mains powered smoke alarm from the base to replace the backup battery and the replacement battery required?

Yes, we do sell the Easichange tool separate to the kits. We also sell the 9v lithium longlife batteries required for these alarms.

Pricing & Availability

Model Stock Price
Product Code: EI166RCEK Stock Level:
More than 20 in stock Expected dispatch: Today

£46.55 inc VAT

£38.79 ex VAT

Delivery Options

The following delivery options are available on this product.

Economy Delivery

£4.79 inc VAT - Orders will be delivered in 3-5 working days by Hermes

Express Delivery

£7.91 inc VAT - Orders will be delivered in 1-2 working days by DHL

Customer Reviews

48 customers have given this product an overall rating of 4.8 out of 5

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 Stars

Reviewed by: S P

Easy DIY replacement An item that's a must but hope not to use

Published on: 15th July 2020

Rating: 5 / 5 Stars

Reviewed by: H P


Published on: 3rd January 2020

Rating: 4 / 5 Stars

Reviewed by: P O

Does the job, and easy to replace the unit Following a power cut-off, the unit was sounding permanently, so I currently have it disconnected, and I will re-try connecting it after a few weeks of leaving the battery to discharge. It may be coming back to you !

Published on: 26th November 2019

Rating: 5 / 5 Stars

Reviewed by: D P

excellent service, delivered on time thank you

Published on: 18th March 2019

Rating: 5 / 5 Stars

Reviewed by: A S

Products exactly as described, fitted in seconds. No Problems at all.

Published on: 7th December 2018

Rating: 5 / 5 Stars

Reviewed by: C D

Easily fitted for peace of mind

Published on: 16th May 2018

Rating: 5 / 5 Stars

Reviewed by: T P

Brilliant service

Published on: 8th April 2018

Rating: 5 / 5 Stars

Reviewed by: D H

Easy to use

Published on: 18th March 2018

Rating: 5 / 5 Stars

Reviewed by: A W

Easy to replace

Published on: 13th February 2018

Rating: 5 / 5 Stars

Reviewed by: D N

easily fitted replacement for withdrawn product

Published on: 12th February 2018

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