OPEN 7 DAYS A WEEK 0800 612 6537 Lines open today 8:30am - 5pm

10 Year Longlife Battery Radio-Interlinked Heat Alarm - EI603TYCRF

EI603TYCRF Radio-Interlink Heat Alarm

Discontinued Product

This product has been discontinued and is no longer available to buy.

alternative product

Ei603RF 10 Year Wireless Heat Alarm

  • Battery: Built-in, lasts the lifetime of your alarm
  • Warranty: 5 year warranty
  • Radio-interlinked heat alarm
  • Built-in RadioLINK+ repeater function
  • Self-tests every 16 seconds
  • Twist-on base design for simple installation
  • Suitable for BS 5839-6: 2019 Grade F1
  • Kitemarked to BS 5446-2: 2003
  • Also suitable for the 2022 Scottish legislation

£131.03 inc VAT

£109.19 ex VAT

View Product
Product Overview

The battery operated radio-interlinked heat alarm is perfect for kitchens and areas where smoke alarms are prone to cause false alerts.  The alarm is easy to fit and can be radio-interlinked with up to 11 other units.

  • Powered by a 10 year sealed lithium battery
  • 5 year manufacturer's warranty
  • RF range 150 metres (minimum) in free space and up to 30 metres in buildings
  • Built-in radioLINK repeater function allows for the RF signal to work around obstructions
  • A maximum of 12 radio-interlinked smoke alarms or heat alarms can be installed
  • Suitable for installations complying to BS 5839-6: 2013 Grade F
  • Kitemarked to BS EN5446-2:2003
  • CE marked
  • LED power indicator
  • Battery 'low' warning
  • With test button
  • Compatible with all other Ei radio-interlinked alarms
  • Digitally coded to avoid interference with neighbouring systems
  • Requires no cables between units and no power supply
  • Supplied with RF module
  • Easy-to-fit RF module needs connecting before installation
  • Supplied with fixings; 2 x screws and 2 x rawl plugs

The table below shows all the units that can interlink with the EI603TYCRF.

Alarms from the Same Series
Model Number
Type of unit
Type of interlink
Ei650RF Battery powered optical alarm Radio-interlinked
Ei603TYCRF Battery powered heat alarm Radio-interlinked
Compatible Alarms
Model Number
Type of unit
Type of interlink
Ei161eRF Ionisation Smoke Alarm Radio-interlinked using the Ei100MRF module
Ei164eRF Heat Alarm Radio-interlinked using the Ei100MRF module
Ei166eRF Optical Smoke Alarm Radio-interlinked using the Ei100MRF module
Ei2110eRF Multi Sensor Smoke & Heat Alarm Radio-interlinked using the Ei100MRF module
Ei168RC/141RC Mains powered ionisation alarm (Alkaline back up) Radio-interlinked using the Ei168RC base
Ei168RC/144RC Mains powered heat alarm (Alkaline back up) Radio-interlinked using the Ei168RC base
Ei168RC/146RC Mains powered optical alarm (Alkaline back up) Radio-interlinked using the Ei168RC base
Carbon Monoxide Alarms
Model Number
Type of unit
Type of interlink
Ei208WRF Battery powered CO detector Radio-interlinked
Ei262 Mains powered CO detector Radio-interlinked
Ancillary Products
Model Number
Type of unit
Type of interlink
Ei407 Wireless Manual Call Point Radio-interlinked
Ei411H Wireless Locate, Hush and Remote test switch Radio-interlinked
Ei412 Wireless Fire and CO Alarm Control Switch Radio-interlinked
Ei450 Wireless Fire and CO Alarm Controller Radio-interlinked
Technical Data
Product Code EI603TYCRF
Alternative Product Codes Ei603, Ei603RF, Ei603TYC
Brand EI Electronics
Battery Type

Longlife Lithium

Dimensions (HxWxD)


Operating Temperature

0°C to 40°C

Relative Humidity

15% to 95% Relative Humidity

Sound Output


Weight 0.20kg
Product Datasheets
FAQs (11)
Q. Please could you explain how the repeater function works on the Aico/Ei radio interlinked detectors.

Hello. The radioLINK repeater function allows the smoke alarm to "repeat" the radio frequency signal around obstructions. This stops the signal from becoming blocked and ensures that all interlinked alarms can be reached. This repeater function is built-in to the the Ei168RC radioLINK base (with Ei140, Ei160 or Ei2110 alarm), the Ei600 series of radio interlinked battery powered smoke and heat alarms as well as the Ei262 and Ei208WRF carbon monoxide alarms as standard. When house coded, the system works itself out which alarms are to act as repeaters - it's not something you set up yourself.

Q. What is the difference between Ei3100RF radio-interlinked smoke alarm series and the Ei600 series of radio-interlinked smoke alarms? Why does one cost much more than the other?

The EI600RF series are a later model and on top of all the features that the Ei3100RF offers, the series has the possibility to use the locate feature in the control switch, making the product more similar to a BS5839 part 6 Grade A alarm system. Additionally, the Ei600 series smoke alarms are offered with a true ten year life sealed lithium battery which makes the alarms acceptable in most circumstances as a BS5839 part 6 Grade D fire alarm system. This offers a substantial saving to customers, as it replaces the need for an electrician installing mains powered alarms.

Q. If the radio interlinking signal on one unit fails will the units still work as stand alone units.

Yes, should the radio interlinking signal fail the units will continue to sound independently should they detect a fire.

Q. Can a wireless router interfere with the radio interlinked alarms?

A wireless router is very unlikely to interfere with the signal of your radio interlinked alarms, as the RF signal of the smoke alarms is digitally coded.

Q. Do the radio interlinked units give out a constant signal all the time and does this decrease the battery life more than a non-interlinked alarm?

Yes, radio interlinked alarms are periodically sending and receiving signals from other units in the network and therefore the life of the battery is reduced. Units with alkaline batteries should have the batteries are changed annually [unless they are fitted with a sealed 10 year battery as eg in the Ei600RF series].

Show All

Customer Reviews

8 customers have given this product an overall rating of 4.5 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: D H

Recommended the use of these before and now I have bought them myself.

Published on: 2nd May 2017

Rating: 5 / 5 Stars

Reviewed by: A M

excellent when you have no ceiling void No wiring.

Published on: 30th January 2017

Rating: 5 / 5 Stars

Reviewed by: C R

Easy to fit, slightly tricky to set up, but works well.

Published on: 28th October 2016

Rating: 4 / 5 Stars

Reviewed by: N W

Fitted and tested but not used in anger !! Attractive size

Published on: 11th March 2016

Rating: 4 / 5 Stars

Reviewed by:

Easy to fit - just needed to clip in the radio link unit and connect. Doesn't look like picture.

Published on: 7th December 2015

Rating: 4 / 5 Stars

Reviewed by:

interfacing installation commissioning easily carried out

Published on: 25th May 2014

Rating: 4 / 5 Stars

Reviewed by:

Easy to set up and install

Published on: 17th April 2014

Rating: 5 / 5 Stars

Reviewed by:

So nice not to have to mess with wires Tried to work out how to power the mains version in the house we have just moved into but couldn't. These solve the problem. All installed and linked in 30 minutes.

Published on: 2nd December 2013

Looking for more information?

If you have any questions or would like more information about/ this product you can ask one of our specialists.

Live Chat Available Now
Direct Telephone 01507 464181