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10 Year Longlife Battery Radio-Interlinked Heat Alarm - Aico Ei603RF

4 Customer Reviews
£131.03 inc VAT
£109.19 ex VAT
Product Overview

The Ei603RF heat alarm has a sealed 10 year lithium battery designed to last the full lifetime of the alarm with a built-in RadioLINK+ module allowing it to wirelessly interlink with other RadioLINK and RadioLINK+ devices, ensuring occupants have the earliest possible warning of a fire in the property. Heat alarms detect fire by sensing the rise in temperature in their surroundings rather than sampling the air, meaning the Ei603RF is suitable for the loft, kitchen, or garage where dust and fumes may cause nuisance alarms with other types of detector.

  • Battery: Built-in, lasts the lifetime of your alarm
  • Warranty: 5 year warranty
  • Easy to install with a twist-on base design
  • Alarm performs a self-test every 16 seconds
  • RadioLINK+ wireless technology built in
  • Red LED status indicator – flashes every 40 seconds during normal operation
  • Optional adhesive pad can be added before checkout
  • Suitable for installations complying to BS 5839-6: 2019 Grade F1
  • Screws and fixings supplied with the alarm
  • CE Marked and Kitemarked to BS 5446-2: 2003
  • This alarm is also suitable for the updated 2022 Scottish legislation for fire alarms in homes

The table below shows all the units that can interlink with the EI603RF.

Smoke and Heat Alarms

Model Number
Type of Unit
Type of Interlink
Ei3014RF Mains Powered Heat Alarm - Sealed Lithium Radio Interlink
Ei3016RF Mains Powered Optical Smoke Alarm - Sealed Lithium Radio Interlink
Ei3024RF Mains Powered Optical & Heat Alarm - Sealed Lithium Radio Interlink
Ei3028RF Mains Powered Heat & Carbon Monoxide Alarm - Sealed Lithium Radio Interlink
Ei2110eRF Mains Powered Multi Sensor Smoke & Heat Alarm - Sealed Lithium Radio Interlink
Ei161eRF Mains Powered Ionisation Smoke Alarm - Sealed Lithium Radio Interlink
Ei164eRF Mains Powered Heat Alarm - Sealed Lithium Radio Interlink
Ei166eRF Mains Powered Optical Smoke Alarm - Sealed Lithium Radio Interlink
Ei168RC/141RC Mains Powered Ionisation Alarm - 9V Alkaline Radio Interlink
Ei168RC/144RC Mains Powered Heat Alarm - 9V Alkaline Radio Interlink
Ei168RC/146RC Mains Powered Optical Smoke Alarm - 9V Alkaline Radio Interlink
Ei3100RF Battery Powered Ionisation Smoke Alarm - 9V Alkaline Radio Interlink
Ei3103RF Battery Powered Heat Alarm - 9V Alkaline Radio Interlink
Ei3105RF Battery Powered Optical Smoke Alarm - 9V Alkaline Radio Interlink
Ei603RF Battery Powered Heat Alarm - Sealed Lithium Radio Interlink
Ei650RF Battery Powered Optical Smoke Alarm - Sealed Lithium Radio Interlink

Carbon Monoxide Alarms

Model Number
Type of unit
Type of interlink
Ei3018RF Mains Powered Carbon Monoxide Alarm - Sealed Lithium Radio Interlink
Ei3028RF Mains Powered Heat & Carbon Monoxide Alarm - Sealed Lithium Radio Interlink
Ei262 Mains Powered Carbon Monoxide Alarm - Sealed Lithium Radio Interlink
Ei208WRF Battery Powered Carbon Monoxide Detector - Sealed Lithium Radio Iinterlink

Ancillary Products

Model Number
Type of unit
Type of interlink
Ei170RF Mains Powered Strobe and Vibration Pad for the Hearing Impaired - Sealed Lithium Radio Interlink
Ei450 Battery Powered Fire and CO Alarm Controller - Sealed Lithium Radio Interlink
Ei411H Battery Powered Locate, Silence & Test Control Switch - Sealed Lithium Radio Interlink
Ei407 Battery Powered Manual Call Point - Sealed Lithium Radio Interlink
Ei410TRF Battery Powered Test Remote - Sealed Lithium Radio Interlink (Ei3100RF Series)
Ei428 Mains Powered 5A Relay Module Radio Interlink
Y03 Mains Powered Multi Frequency Sounder Hardwire Interlink (via relay)
SAB300C Mains Powered Flashing Xenon Strobe (Clear) Hardwire Interlink (via relay)
SAB300R Mains Powered Flashing Xenon Strobe (Red) Hardwire Interlink (via relay)

Wiring Explained

Mains powered Ei Electronics smoke and heat alarms require a 230V AC power supply and up to 12 alarms can be hardwire interlinked in one system.

To obtain a mains power supply, each alarm can be connected to the nearest lighting circuit using 2 core and earth cable with a separate, dedicated interlink cable connecting alarms where applicable. However, if possible it is recommended that any alarms connected via interlink cable are all powered from a dedicated circuit from the distribution board using 3 core and earth cable for safety during maintenance, as the interlink cable will carry power from live alarms on other power circuits. Please see the diagram below:-

Wiring Mains Powered Alarms

Technical Data
Product Code EI603RF
Alternative Product Codes EI603RF, EI603, Ei603, Ei603C, Ei603CRF, Ei603TYCRF
Brand EI Electronics
Battery Type

10 Year Sealed Lithium

Dimensions (HxDia)


Operating Temperature

Operating: 0°C to +40°C

Storage: 0°C to +35°C

Relative Humidity

15% to 95%

Sound Output



5 Years

Weight 0.28kg
Product Datasheets
FAQs (11)
Q. Are there any restrictions to the distance a radio-interlinked smoke alarm will work?

Most radio-interlinked alarms have a range of 150 meters in an open space and up to 30 meters in buildings. The thickness of the walls and partitions will affect the travel distance of the signal.

Q. How can we test the alarm to make sure it is working?

The manufacturer's recommendation is to test the alarm by pressing the test button. This will simulate a heat input at the heat sensor. You can also test it with a hair dryer but make sure that the hairdryer is kept away at a suitable distance from the alarm. Do not attempt to test the alarm by using open fire or excessive heat as this may damage the unit.

Q. Is it possible to have a heat alarm mains powered radio interlinking alarm interconnect with battery powered radio-interlinked alarms?

Yes this entirely possible. The Ei140 series with RF base is mains powered and these are compatible to interlink with the battery operated Ei3100 series. Please view the interconnection overview on either of these alarms for further details.

Q. Are the battery radio-interlinked smoke alarms suitable to install in a four storey house with thick walls?

Our radio-interlinked smoke detectors have a radio frequency range of about 30 meters in buildings. This means that as long as the detectors are all within 30 meters of each other, the interconnection should be achieved. Some of the RF smoke alarms can also act as repeaters, which means that larger distances can be achieved. So, a four storey house should normally be suitable for RF install.

Q. Do the Ei600 series alarms need 230v or do they just use battery?

The Ei600 series of radio-interlinked alarms are completely battery operated. This means that they do not need to be wired up to the mains circuit. On the website, we offer the Ei600 series with a standard 9v battery or with a 10 year lithium longlife battery. The standard 9V batteries last approximately 12-18 months depending on how often the detectors are tested. The lithium battery units are sealed and last 10 years i.e. the full lifespan of the detector.

Q. Where more than one radio-interlinked battery operated smoke alarm is installed, if the battery in one alarm failed would the other alarms be affected?

If one alarm was to malfunction the other units would not be affected, if it was due to alarm failure. If the fault was with the radio-interlinking signal, then all alarms that are in the chain after the faulty alarm would be affected and they would not go off.

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].

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. 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. 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. 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.

Pricing & Availability

Model Stock Price
Product Code: EI603RF Stock Level:
18 in stock Expected dispatch: Today

£131.03 inc VAT

£109.19 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 Hermes

Customer Reviews

4 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: 4 / 5 Stars

Reviewed by: D B

Easy to fit and test

Published on: 15th February 2021

Rating: 5 / 5 Stars

Reviewed by: J G

Easy to fit and link. Set an alarm to remind you to replace it in 10 yeqrs time.

Published on: 15th December 2020

Rating: 5 / 5 Stars

Reviewed by: K F

Fantastic product. Very easy to install. Would recommend.

Published on: 9th February 2018

Rating: 5 / 5 Stars

Reviewed by: S N

Easy installation and quick to program.

Published on: 28th January 2018

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